Nivagen sildenafil

Taking Viagra (sildenafil) as instructed may improve its effectiveness for erectile dysfunction. Viagra (sildenafil) is a common medication for erectile dysfunction (ED). Like any medication, how you take it may affect treatment outcomes. In this video, learn tips for taking Viagra to get the best results.

sildenafil citrate tablet, film coated NDC Code(s): 50436-0035-1, 50436-0036-1Cialis and Viagra are both phosphodiesterase type 5 (PDE5) inhibitors. PDE5 is an important enzyme involved in erections that's one of the biggest culprits behind ED.. Here's how Cialis and ...Nivagen Pharmaceuticals, Inc.-----HIGHLIGHTS OF PRESCRIBING INFORMATION These highlights do not include all the information needed to use METOPROLOL SUCCINATE EXTENDED-RELEASE TABLETS safely and effectively. See full prescribing information for METOPROLOL SUCCINATE EXTENDED-RELEASE TABLETS.A sildenafil (generic Viagra) membership starts at $20 monthly for six tablets of 30 mg. For $120 each month, you'll receive 34 sildenafil tablets of 45 mg each. Generic Viagra (sildenafil): $20 to $120 per month. Generic Cialis (tadalafil): $20 to $120 per month.Viagra can last up to 5 hours or longer depending on your dosage, Viagra is a brand-name medication. It's also available in a generic form called sildenafil. Gastro-oesophageal reflux disease (acid reflux, symptoms include heartburn) Blood in urine (pee) Pain in the arms or legs.Sildenafil has an average rating of 8.2 out of 10 from a total of 506 ratings on Drugs.com. 78% of reviewers reported a positive effect, while 12% reported a negative effect. Vardenafil has an average rating of 8.0 out of 10 from a total of 173 ratings on Drugs.com. 75% of reviewers reported a positive effect, while 10% reported a negative ...Viagra comes in three dosages: 25mg, 50mg and 100mg.Most patients start at 50mg. Sildenafil pills similarly come in 25mg, 50mg, and 100mg tablets. However, sildenafil can also come in 20mg tablets when they are the generic version of Revatio. Revatio is FDA approved to treat a type of high blood pressure in the lungs (called pulmonary arterial hypertension, or PAH), but it can be prescribed ...The combination of prostanoids and sildenafil therefore has potential as a possible future treatment for pulmonary hypertension and numerous reports on the clinical use of sildenafil in pulmonary ...

Still, if your doctor says it's okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price-comparison website GoodRx.com ...Sildenafil injection is used to treat the symptoms of pulmonary arterial hypertension. This is a type of high blood pressure that occurs between the heart and the lungs. When hypertension occurs in the lungs, the heart must work harder to pump enough blood through the lungs. Sildenafil belongs to a group of medicines called phosphodiesterase 5 ...Sildenafil tablets are indicated for the treatment of erectile dysfunction. 2.1 Dosage Information - For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, sildenafil tablets may be taken anywhere from 30 ... Sildenafil tablets, USP is supplied as white, film-coated, rounded ...NIVAGEN PHARMACEUTICALS, INC.-----HIGHLIGHTS OF PRESCRIBING INFORMATION These highlights do not include all the information needed to use TADALAFIL TABLETS safely and effectively. See full prescribing information for TADALAFIL TABLETS. TADALAFIL tablets, for oral use Initial U.S. Approval: 2003 RECENT MAJOR CHANGESSildenafil tablets are indicated for the treatment of erectile dysfunction. 2 DOSAGE AND ADMINISTRATION 2.1 Dosage Information. For most patients, the …

See a doctor if you notice any of the following uncommon or rare side effects when you take Teva sildenafil: sharp or burning chest pain that gets worse over time. pain in your bladder. stomach ...Sildenafil citrate is a white to off-white crystalline powder with a solubility of 3.5 mg/mL in water and a molecular weight of 666.7. VIAGRA is formulated as blue, film-coated rounded-diamond-shaped tablets equivalent to 25 mg, 50 mg, and 100 mg of sildenafil for oral administration.About Us. Nivagen is engaged in the development, acquisition and sales of generic prescription drugs and over the counter products for the North American market. Our vision is to deliver high quality products at affordable prices by leveraging global partnerships with the best FDA approved manufacturing facilities across the world. Our sales ...SILDENAFIL CITRATE (sildenafil citrate 100 mg) Dailymed. Human Prescription ; Phosphodiesterase 5 Inhibitor . Drug Classes; Phosphodiesterase 5 Inhibitor. Phosphodiesterase 5 Inhibitors. Antihypertensives,other. Genito-urinary Agents,other. NIVAGEN PHARMACEUTICALS, INC. Version History; Go PRO to access past versions. SPL 9 - Dec 09, 2022. SPL ...

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Sildenafil is a phosphodiesterase-5 (PDE5) inhibitor... SILDENAFIL CITRATE (Page 2 of 7) REMEDYREPACK INC. 27 December 2023. 5.4 Hearing Loss. …Viagra (sildenafil) is a prescription drug that’s used to treat erectile dysfunction (ED). The drug comes as a tablet you’ll take by swallowing. It’s usually taken as needed about 1 hour ...Abstract. Background: A growing number of prescription medicines such as Viagra are offered and sold directly to consumers on the Internet. Little is known about the structure and "quality" of these "virtual pharmacies" in terms of how responsibly "online-prescriptions" are actually issued. Objective: To determine to what extent Viagra is sold ...Here's what you can do. 1. Leave her alone. This may not be easy, so try to be patient. In the first two weeks, the bristles may look "spotty", but take our word for it-it's worth waiting a couple more weeks, and its appearance is likely to change for the better. A beard is a naughty thing, and at first every hair has its own life.Background: Men who use erectile dysfunction medications for recreational purposes may be at increased risk of becoming psychologically dependent, which in turn could lead to psychogenic-based erectile dysfunction symptoms. Sildenafil has become one of the most commonly prescribed and abused drugs available today. Objectives: This …Sildenafil Citrate Strength 50 mg Imprint 1A2 Color Blue Shape Capsule/Oblong View details. A 221 A 221. Dantrolene Sodium Strength 100 mg Imprint A 221 A 221 Color Orange & Yellow Shape Capsule/Oblong View details. 1 / 2 Loading. Cipla 200 mg 683. Previous Next. Pregabalin Strength 200 mg Imprint Cipla 200 mg 683 Color Orange Shape Capsule/Oblong

4.1 Nitrates. Consistent with its known effects on the nitric oxide/cGMP pathway [ see Clinical Pharmacology (12.1, 12.2) ], sildenafil tablets was shown to potentiate the hypotensive effects of nitrates, and its administration to patients who are using nitric oxide donors such as organic nitrates or organic nitrites in any form either regularly and/or intermittently is therefore contraindicated.Sildenafil has no effect on visual acuity or contrast sensitivity. In a small size placebo-controlled study of patients with documented early age-related macular degeneration (n=9), sildenafil (single dose, 100mg) demonstrated no significant changes in visual tests conducted (visual acuity, Amsler grid, colour discrimination simulated traffic ...Sildenafil tablets are indicated for the treatment of erectile dysfunction. 2.1 Dosage Information - For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, sildenafil tablets may be taken anywhere from 30 ... Sildenafil tablets USP are supplied as white to off-white, film-coated ...Sildenafil can add to the blood pressure-lowering effect of NIFEdipine. Contact your doctor if you experience signs and symptoms of low blood pressure such as dizziness, lightheadedness, fainting, flushing, headache, or a rapid pulse or heart rate. You may be more likely to experience these problems at the beginning of treatment, following a ...Jan 11, 2021 · Sildenafil (Revatio) is a phosphodiesterase 5 (PDE-5) blocker that relaxes blood vessels in the lungs. This allows blood to flow better and lowers the blood pressure in the lungs. Your heart is able to pump better, your body gets more oxygen, and you should be able to breathe and exercise more easily. PDE-5 blockers also relax blood vessels in ... A. Sildenafil (Viagra) Use for Erectile Dysfunction. Male erectile dysfunction defined as "the inability to attain and/or maintain penile erection sufficient for satisfactory sexual performance" 1 is a common problem in the United States affecting between 10 and 30 million men. 2 3 Sexual dysfunction in men after the diagnosis of coronary artery disease or a myocardial infarction is common.If you live in one of these four states, you can get a tax credit that's as good as the state donating to your favorite candidate. By clicking "TRY IT", I agree to receive newslett...Apr 1, 2021 · A typical starting dose of sildenafil is 50 milligrams, which you’d take 30 minutes to four hours before sexy time. Your provider may adjust your dosage depending on your needs and how you respond to the medication. It’s also possible to be prescribed doses in multiples of 20 mg, including 20 mg, 40 mg, 60 mg and 80 mg.

Manufactured for: Nivagen Pharmaceuticals, Inc. Sacramento, CA 95827, USA Toll free number: 1-877-977-0687 Revision Date: 04/2023; V-02 Patient Information Tadalafil (ta·dal·a·fil) Tablets Read this important information before you start taking tadalafil tablets and each time you get a refill.

Sildenafil is a prescription drug. It comes in the form of a tablet and suspension (liquid). Both are taken by mouth. It also comes in an intravenous (IV) form, which is only given by a doctor.Sildenafil is the active ingredient in Viagra®, one of the most popular drugs in the world. Tens of millions of men have used sildenafil to successfully manage the symptoms of erectile dysfunction. However, sildenafil doesn't work for everyone. It's effective for around 82 percent of men, according to research.Sildenafil has the property of relaxing the smooth muscle of the blood vessels and widening them which can cause a fall in blood pressure (hypotension). So, when used with blood pressure lowering medicines or nitrates, it can cause a severe fall in blood pressure, which could be fatal. Sildenafil should not be taken if you are taking …Viagra comes as an oral tablet in different dosages. Discuss with your doctor what’s an appropriate dose for you. For daily use, Goldstein said, the generic form, sildenafil, comes in 20-mg tablets.Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men. It is also used to treat pulmonary arterial hypertension, a serious heart and lung condition.This drug is more popular than comparable drugs. It is available in generic and brand versions. Generic sildenafil is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices ...VIAGRA can cause your blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not take VIAGRA if you take any other medicines called "nitrates." Nitrates are used to treat chest pain (angina). A sudden drop in blood pressure can cause you to feel dizzy, faint, or have a heart attack or stroke.Viagra can last up to 5 hours or longer depending on your dosage, Viagra is a brand-name medication. It’s also available in a generic form called sildenafil. Gastro-oesophageal reflux disease (acid reflux, symptoms include heartburn) …Interventions. Sildenafil is a phosphodiesterase-5 (PDE-5) inhibitor that was originally FDA-approved for the treatment of erectile dysfunction, but was later investigated for PAH in the SUPER trial, in which sildenafil led to improvements in 6WMD, mPAP, and functional class [].In a sub-group of connective tissue disease PAH, most of whom had SSc, significant benefit was seen with sildenafil []. Maria Hudson. 4 hrs. ago. Anna Nelson. 6 hrs. ago. David Muldon. 8 hrs. ago Sildenafil is an oral therapy for erectile dysfunction of a broad range of causes. By selectively inhibiting phosphodiesterase type 5, it allows corpus cavernosum smooth muscle to relax, potentiating erections during sexual stimulation. Blood pressure is reduced transiently by sildenafil, but more marked hypotension may occur during concurrent ...

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Drug Name Special Code Tier Category Alphabetical Index Last Updated 5/1/2024 State of Arkansas Formulary Cont. amiloride/hydrochlorothiazide tab (MODURETIC equiv) - 1 DIURETICS aminocaproic acid soln (AMICAR equiv) - 2 HEMOSTATICSCheck your Citi Merchant Offers for an offer from IHG that could save you up to 20% off your next Holiday Inn Express stay! We may be compensated when you click on product links, s...Sildenafil citrate is a white to off-white powder, slightly soluble in water and methanol with a molecular weight of 666.7. Sildenafil tablets, USP are formulated as blue, film-coated oval biconvex tablets equivalent to 25 mg, 50 mg and 100 mg of sildenafil for oral administration.2. Choose a lighter meal. While you may be looking forward to ordering that high-fat savory meal on date night, you could be changing the way that your Viagra or Sildenafil are getting into your body after a dense dinner. Studies show that eating a high-fat meal around the same time that you are taking your Viagra or Sildenafil may increase the ...Objective: To compare the rate and extent of absorption of two sildenafil tablet formulations (Tonafil®, T.O. Chemicals (1979) Ltd., Thailand as a test formulation and Viagra®, Pfizer Pty Limited., Australia as a reference formulation) in healthy Thai male volunteers after single-dose administration under fasting condition. Methods: A randomized crossover study with a washout period of 2 ...Abstract: Described is an aqueous calcium gluconate solution formulated without calcium saccharate, which can be stored in a flexible plastic bag and can be terminally sterilized. Type: Grant. Filed: July 22, 2022. Date of Patent: June 13, 2023. Assignee: Nivagen Pharmaceuticals, Inc.Cialis (tadalafil) is a prescription medication used to treat erectile dysfunction (ED). It also manages symptoms of an enlarged prostate. Cialis has two different dosing options. You can take it as needed before sex or consistently each day. Cialis is available as a lower-cost generic.A. Sildenafil (Viagra) Use for Erectile Dysfunction. Male erectile dysfunction defined as “the inability to attain and/or maintain penile erection sufficient for satisfactory sexual performance” 1 is a common problem in the United States affecting between 10 and 30 million men. 2 3 Sexual dysfunction in men after the diagnosis of coronary artery …Sildenafil Cheapest Prices Buy the Viagra and Sildenafil pill online. Get the same medication for a fraction of the cost with generic Viagra. Sildenafil starts at just $1 / 20mg pill. (Sildenafil 20 mg) will vary, too, and discount coupons for the generic may be found online to be used Our online pharmacy charges $0.5/20mg pill, including free delivery. ….

CHOOSE BRAND-NAME VIAGRA. The original little blue pill prescribed by doctors for over 20 years. Clinically proven to treat men with erectile dysfunction (ED) Ongoing commitment to product quality and safety monitoring. Learn More.SILDENAFIL (sil DEN a fil) treats erectile dysfunction (ED). It works by increasing blood flow to the penis, which helps to maintain an erection. This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions. COMMON BRAND NAME (S): Viagra.In the 7 years since sildenafil citrate (VIAGRA) was introduced as the first oral phosphodiesterase type 5 inhibitor therapy for erectile dysfunction, it has been used to treat nearly 27 million ...Conclusions: Our data confirm that sildenafil enhances dopaminergic activity in the NAcc, extend these findings to the mPOA and furthermore, reveal sildenafil-induced effects on serotonergic activity in these brain regions as well. Therefore, present findings support an effect of sildenafil on central neural pathways that are involved in the ...Tadalafil (Cialis) is taken by mouth either as needed before sexual activity or once daily for erectile dysfunction (ED).It's also taken once daily to treat symptoms from an enlarged prostate (benign prostatic hyperplasia, or BPH).Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include headache and indigestion.Sildenafil tablets, USP are supplied as pale blue to blue, caplet shaped film-coated tablets containing sildenafil citrate USP equivalent to 50 mg, or 100 mg of sildenafil. Tablets are debossed with 1A1 and 1A2 on one side and plain on the other to indicate the dosage strengths viz. 100 mg and 50 mg respectively.Sildenafil (Viagra ®; Pfizer, New York, USA) was Pfizer's blockbuster wonder drug as "blue pill" for erectile dysfunction (ED) which sold like hot cakes soon after its release.Although it ...Sildenafil is a generic prescription drug that's used to treat erectile dysfunction (ED) and pulmonary arterial hypertension (PAH). Sildenafil is available as the brand-name drugs Revatio and ... Nivagen sildenafil, Revatio is used for pulmonary arterial hypertension (PAH) while Viagra is used to treat erectile dysfunction (ED). Revatio comes in different dosage forms such as tablets, injections, and oral liquids. Compared to Viagra, Revatio is administered three times per day at a lower dose. Viagra is taken at a higher dose not more than once per day., Background: To investigate the long-term efficacy and safety of sildenafil for patients with erectile dysfunction (ED). Methods: Between March 1999 and February 2001, a total of 3168 patients visited Taipei Veterans General Hospital for prescription of sildenafil. The follow-up period was 1-3 years. A questionnaire was designed for evaluation of efficacy and safety of sildenafil via telephone ..., Sildenafil tablets are indicated for the treatment of erectile dysfunction. 2 DOSAGE AND ADMINISTRATION 2.1 Dosage Information. For most patients, the …, What are the main differences between Levitra and Viagra? Levitra (vardenafil), also known by its generic name vardenafil, and Viagra, also known by its generic name, sildenafil, are both PDE-5 inhibitors.Both drugs are available in tablet form as brand and generic. Regardless of dose, these medications should not be taken more than once in a day in the treatment of ED., To the church going parents with young kiddos. Taking children to church can be a rewarding and enriching experience, but it can also be challenging, especially when they start to...., Both take about 30 minutes to begin working, and once the drug is absorbed by the body the effects usually last for roughly 4 hours. Tadalafil, however, lasts for a substantially longer time than either sildenafil or vardenafil. In most cases, one dose of tadalafil will take effect in roughly 30 minutes and provide noticeable effects for as ..., Nivagen is eligible for 180 days of CGT exclusivity for Cysteine Hydrochloride Injection USP, 725 mg/10 mL (72.5 mg/mL) Single-Dose Vial, under section 505(j)(5)(B)(v) of the FD&C Act. This exclusivity begins to run from the date of the first commercial marketing of the CGT (including the commercial marketing of the listed drug) by Nivagen, as, If you are an Amazon Prime member, see FAQ or call: 1-800-201-7575. If you are a pharmacist, call: 1-866-615-6677. The Amazon Prime Rx benefit offers savings and discounts on prescriptions at nearly 60,000 pharmacies including Amazon Pharmacy. You can get prescription medication discounts at your preferred local pharmacy such as: CVS, Walgreens ..., Sildenafil User Reviews & Ratings. Brand names: Viagra, Revatio, Liqrev. Sildenafil has an average rating of 8.3 out of 10 from a total of 495 reviews on Drugs.com. 78% of …, Sildenafil, sold under the brand name Viagra, among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. It is unclear if it is effective for treating sexual dysfunction in females. It can be taken orally (swallowed by mouth), intravenously ..., Find 124 user ratings and reviews for Sildenafil Oral on WebMD including side effects and drug interactions, medication effectiveness, ease of use and satisfaction., SILDENAFIL (sil DEN a fil) treats erectile dysfunction (ED). It works by increasing blood flow to the penis, which helps to maintain an erection. This medicine may be used for other purposes; ask your health care provider or pharmacist if you have questions. COMMON BRAND NAME (S): Viagra., Cheap Flight Day is supposedly August 23, when airfare is cheaper. But the truth about finding cheap flights, and when to book for the best prices, is complicated. By clicking "TRY..., We have tested a product labelled Dark Horse Capsules and found that: the tablets contain the undeclared substance sildenafil. sildenafil may interact with nitrates found in some prescription drugs and may lower blood pressure to dangerous levels. People with diabetes, high blood pressure, high cholesterol or heart disease are often prescribed ..., It is very dynamic and is considered one of the most effective ways to get rid of excess fat and strengthen muscles. About 500 calories are burned in half an hour. Classes are held mainly in groups accompanied by a coach and accompanied by loud incendiary music. The duration of training is usually from 45 minutes to an hour., Introduction: Sildenafil citrate 50 mg is the recommended starting dose for men with erectile dysfunction (ED); however, most men are later titrated to sildenafil 100 mg for improved efficacy. Aim: Assess the tolerability and efficacy of sildenafil initiated at the 100-mg dose in men with ED. Methods: Men with ED (score < or =25 on the Erectile Function domain of the International Index of ..., The overall rating of Nivagen Pharmaceuticals is 2.9, with Salary & Benefits being rated at the top and given a rating of 3.1. However, Work-Life balance is rated the lowest at 2.7. To know first hand how is it like to work at Nivagen Pharmaceuticals read detailed reviews by job profile, department and location in the reviews section., Sildenafil tablets are indicated for the treatment of erectile dysfunction. 2 DOSAGE AND ADMINISTRATION 2.1 Dosage Information. For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, sildenafil tablets may be taken anywhere from 30 minutes to 4 hours before sexual activity., Sildenafil citrate, USP is a white to off-white crystalline powder with a solubility of 3.5 mg/mL in water and a molecular weight of 666.7. Sildenafil tablets, USP are formulated as white to off-white, oval shaped film-coated tablets equivalent to 25 mg, 50 mg and 100 mg of sildenafil for oral administration., Sildenafil caused a significant reduction of the postejaculatory refractory time (12/30 vs 4/30) (chi(2) test, P=0.04). Sildenafil does not improve erections in young healthy men. Sildenafil should not be given to young healthy men to improve their erections and patients should be advised against recreational abuse of the drug., Transfer your prescription for Nivagen Pharma SILDENAFIL 25 MG TABLET (1 Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime members., Sildenafil tablets are indicated for the treatment of erectile dysfunction. 2 DOSAGE AND ADMINISTRATION. 2.1 Dosage Information - For most patients, the …, Sildenafil (Viagra, Revatio) is a moderately priced drug used to treat erection problems in men.It is also used to treat pulmonary arterial hypertension, a serious heart and lung condition.This drug is more popular than comparable drugs. It is available in generic and brand versions. Generic sildenafil is covered by most Medicare and insurance plans, but some pharmacy coupons or cash prices ..., Sildenafil is also used in both men and women to treat the symptoms of pulmonary arterial hypertension. This is a type of high blood pressure that occurs between the heart and the lungs. When hypertension occurs in the lungs, the heart must work harder to pump enough blood through the lungs., REVATIO, phosphodiesterase-5 (PDE-5) inhibitor, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type-5 (PDE-. 5). Sildenafil is also marketed as VIAGRA® for erectile dysfunction. Sildenafil citrate is designated chemically as 1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl ..., Sildenafil citrate, USP is a white to off-white crystalline powder with a solubility of 3.5 mg/mL in water and a molecular weight of 666.7. Sildenafil Tablets USP: Sildenafil citrate is formulated as white, film-coated round tablets for oral administration. Each tablet contains sildenafil citrate equivalent to 20 mg of sildenafil., The efficacy and safety of sildenafil were evaluated in estrogenized and estrogen-deficient women with sexual dysfunction that included female sexual arousal disorder (FSAD). Methods: Patients were randomized to receive 10-100 mg sildenafil or matching placebo. To assess efficacy, patients completed two global efficacy questions (GEQ), the Life ..., Introduction: The serendipitous discovery of sildenafil (Viagra [sildenafil citrate]) as a treatment for erectile dysfunction (ED) is one of the most fascinating drug development stories of our time. When sildenafil was approved by the U.S. Food and Drug Administration in 1998, it revolutionized the treatment protocol for men with ED, once considered a psychological issue or an inevitable part ..., sildenafil citrate 100 mg. OVAL BLUE IAI. View Drug. NIVAGEN PHARMACEUTICALS, INC. sildenafil citrate 100 mg. OVAL BLUE IAI. View Drug. NIVAGEN PHARMACEUTICALS, INC. sildenafil citrate 100 mg. OVAL BLUE IAI. View Drug. NIVAGEN PHARMACEUTICALS, INC. sildenafil citrate 100 mg. OVAL BLUE IAI. View Drug. x Try the Professional Version., Viagra (Brand for Sildenafil, Oral Tablet) For Every Mom. Unraveling the Intricacies of Melioidosis and Rat Bite Fever. Melioidosis, a potentially deadly infectious disease …, Rarely, certain side effects like abnormal heartbeat, heart attack, stroke, bleeding in the lungs, and very bad high blood pressure have happened with this medicine (sildenafil tablets). Sometimes, this has been deadly. Most of the time, these problems happened in people who had heart problems before taking this medicine (sildenafil tablets)., Sildenafil (Viagra) is a phosphodiesterase-5 (PDE-5) inhibitor. PDE-5 is a protein in your body that breaks down the molecules that normally cause an erection. When it blocks PDE-5, sildenafil (Viagra) helps an erection occur by allowing certain muscles in the penis to relax and the penis to fill with blood. info., Sildenafil tablets are indicated for the treatment of erectile dysfunction. 2 DOSAGE AND ADMINISTRATION 2.1 Dosage Information. For most patients, the recommended dose is 50 mg taken, as needed, approximately 1 hour before sexual activity. However, sildenafil tablets may be taken anywhere from 30 minutes to 4 hours before …