The Chemical Structure of Sildenafil Citrate

Sildenafil has been studied for high-altitude pulmonary edema (HAPE), but its use is currently not recommended for that indication. In clinical trials, the most common adverse effects of sildenafil use included headache, flushing, indigestion, nasal congestion, and impaired vision, including photophobia and blurred vision.

Patient Counseling Information

[13][14] It is available as a generic medication. [15][16] In the United Kingdom, it is available as a pharmacy medicine. The primary indication of sildenafil is treatment of erectile dysfunction sildenafil citrate chewable tablets (inability to sustain a satisfactory erection to complete sexual intercourse). Its use is now one of the standard treatments for erectile dysfunction, including for males with diabetes mellitus. Tentative evidence suggests that sildenafil may help males who experience antidepressant-induced erectile dysfunction. [4] Some sildenafil users have complained of seeing everything tinted blue (cyanopsia).

[24] This cyanopsia can be explained because sildenafil, while selective for PDE5, does have some affinity for PDE6, which is the phosphodiesterase found in the retina.

Pregnancy & Lactation

Common side effects include headaches, heartburn, and flushed skin. [8] Caution is advised in those with cardiovascular disease. [8] Rare but serious side effects include vision problems, hearing loss, and prolonged erection (priapism) that can lead to damage to the penis. [8] Sildenafil should not be taken by people on nitric oxide donors such as nitroglycerin, as this may result in a serious drop in blood pressure. Sildenafil acts by blocking phosphodiesterase 5 (PDE5), an enzyme that promotes breakdown of cGMP, which regulates blood flow in the penis.

Brand Names

[8] It requires sexual arousal to work, and does not by itself cause or increase sexual arousal. [8] It also results in dilation of the blood vessels in the lungs. Pfizer originally discovered the medication in 1989 while looking for a treatment for angina. [11] It was approved for medical use in the United States and in the European Union in 1998. [5][8][11][12] In 2023, it was the 151st most commonly prescribed medication in the United States, with more than 3 million prescriptions. Patients thus taking the drug may experience colorvision abnormalities.

Some complained of blurriness and loss of peripheral vision.

Frequently asked questions

Avoid using any other medicines to treat impotence, such as alprostadil or yohimbine, without first talking to your doctor. Tell your healthcare provider about all the medicines you take, including prescription and over-the-countermedicines, vitamins, and herbal supplements. Sildenafil may affect the way other medicines work, and other medicines may affect the way sildenafil works, causing side effects. Especially tell your healthcare provider if you take: Nitrates for chest pain or heart problems. This includes nitroglycerin, isosorbide dinitrate, and isosorbide mononitrate.

Dosage and Administration

Nitrates are also found in some recreational drugs such as amyl nitrate or nitrite ("poppers"). Taking sildenafil with a nitrate medicine can cause a sudden and serious decrease in blood pressure Alpha-blockers are sometimes prescribed for prostate problems orhigh blood pressure. In some patients, the use of sildenafil with alpha-blockers can lead to a drop in blood pressure or fainting Other drugs to treat high blood pressure or a prostate disorder Medicines to treat HIV, such as protease inhibitors, such as ritonavir and saquinavir Some types of oral antifungal medicines, such as ketoconazole and itraconazole Some types of antibiotics, such as erythromycin Other medicines that treat high blood pressure Medicines or treatments for ED, such as avanafil (Stendra), tadalafil (Cialis), or vardenafil (Levitra). Tell your doctor about all other medications you use for erectile dysfunction. Ask your healthcare provider or pharmacist for a list of these medicines if you are not sure.

How can I get Viagra to work?

Keep a list of them to show to your healthcare provider and pharmacist when you get a sildenafil from canada new medicine. Other drugs may interact with sildenafil, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here. Store sildenafil tablets and oral film at room temperature, between 20°C and 25°C (68°F and 77°F). Store sildenafil reconstituted oral suspension below 30°C (86°F) or in a refrigerator between 2°C to 8°C (36°F to 46°F). In July 2005, the US Food and Drug Administration (FDA) updated labeling for tadalafil (Cialis), vardenafil (Levitra), and sildenafil (Viagra) to reflect a small number of post-marketing reports of sudden vision loss, while acknowledging that "...it is not possible to determine whether these oral medicines for erectile dysfunction were the cause of the loss of eyesight or whether the problem is related to other factors such as high blood pressure or diabetes, or to a combination of these problems.

• Sildenafil is available in most countries through prescription only.
• It is used worldwide, with varying approval statuses.
• FDA and EMA have rigorous testing standards for sildenafil.
• Using the drug responsibly can lead to successful treatment outcomes.
• Combining sildenafil with other medications requires medical supervision.
• Be aware of the potential for drug interactions with heart or blood pressure meds.
• Always consult a healthcare professional for personalized advice.

"[25] A careful review of pooled data from clinical trials containing well documented information about the dose and duration of exposure to the drug for a large number of patients, yields no evidence for an increased risk of non-arteritic anterior ischemic optic neuropathy or other adverse ocular events associated with PDE5 inhibitor use.

Chemical synthesis

Throw away the reconstituted oral suspension after 60 days. Active ingredient: sildenafil citrateInactive ingredients: dextrose and water for injection. Contains no ingredients made from gluten-containing grain (eg, wheat, barley, or rye). Revatio is distributed by Pfizer Labs, Division of Pfizer Inc., NY, NY 10017. Viagra is distributed by Pfizer Labs, Division of Pfizer Inc., NY, NY 10017.

Interactions that increase your risk for side effects

It is distributed by: IBSA Pharma Inc, Parsippany, NJ 07054 USA. Cialis vs Viagra - What's the difference between them? Do you know these 11 amazing facts about Viagra? Is generic Viagra available in the U.S.? Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

FDA-Labeled Indications and Dosage (Adult)

Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4][8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [9] It is unclear if it is effective for treating sexual dysfunction in females. [8] It can be taken orally (swallowed by sildenafil otc mouth), intravenously (injection into a vein), or through the sublingual route (dissolved under the tongue). [8][10] Onset when taken orally is typically within twenty minutes and lasts for about two hours. Rare but serious adverse effects found through postmarketing surveillance include prolonged erections, severe low blood pressure, myocardial infarction (heart attack), ventricular arrhythmias, stroke, increased intraocular pressure, and sudden hearing loss.

• Sildenafil is unsuitable for individuals with severe liver disease.
• Patients should avoid alcohol consumption during treatment.
• Some side effects may resolve on their own within hours.
• Persistent side effects should prompt medical consultation.
• The drug does not cure ED but manages symptoms.
• Lifestyle changes can also improve erectile function.
• Follow your healthcare provider’s instructions precisely.

[4] In October 2007, the FDA announced that the labeling for all PDE5 inhibitors, including sildenafil, required a more prominent warning of the potential risk of sudden hearing loss.

What other drugs will affect sildenafil?

Take sildenafil exactly as it was prescribed for you. Follow all directions on your prescription label and read all medication guides or instruction sheets. Do not change your dose or stop taking this medicine on your own. Take sildenafil tablet or oral suspension 3 times a day, about 4 to 6 hours apart. Take at approximately the same times every day.

Antihypertensive and α-Adrenergic Blocking Agents

Sildenafil oral suspension will be mixed for you by your pharmacist. Do not mix with other medicines or flavorings. Shake the oral suspension (liquid) before you measure a dose. Use the dosing syringe provided, or use a medicine dose-measuring device (not a kitchen spoon). When sildenafil is used for ED, it is used as needed, so you are not likely to miss a dose.

Regional issues

If you are taking sildenafil for PAH and you miss a dose, take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time. If you take too much sildenafil, call your doctor or go to the nearest hospital emergency room. Drinking alcohol with sildenafil can cause side effects. Grapefruit juice and products may interact with sildenafil, leading to unwanted side effects. Care should be exercised by people who are also taking protease inhibitors for the treatment of HIV infection.

Protease inhibitors inhibit the metabolism of sildenafil, effectively multiplying the plasma levels of sildenafil, increasing the incidence and severity of side effects. Those using protease inhibitors are recommended to limit their use of sildenafil to no more than one 25 mg dose every 48 hours.

• Sildenafil citrate may cause a drop in blood pressure.
• Do not consume large quantities of grapefruit juice while on sildenafil.
• Pregnant or breastfeeding women should not use sildenafil without guidance.
• The drug does not improve libido, only facilitates blood flow.
• It is not intended for recreational use or enhancement.
• Psychological factors can also affect the efficacy of sildenafil.
• Regular medical check-ups are recommended for long-term users.

[4] Other drugs that interfere with the metabolism of sildenafil include erythromycin and cimetidine, both of which can also lead to prolonged plasma half-life levels.

The use of sildenafil and an α1 blocker (typically prescribed for hypertension or for urologic conditions, such as benign prostatic hypertrophy) at the same time may lead to low blood pressure, but this effect does not occur if they are taken at least 4 hours apart.

Enhancing Healthcare Team Outcomes

While sildenafil improves some markers of disease in people with pulmonary arterial hypertension, it does not appear to affect the risk of death or serious side effects. Sildenafil and other PDE5 inhibitors are used off-label to alleviate vasospasm and treat severe ischemia and ulcers in fingers and toes for people with secondary Raynaud's phenomenon;[9][21] these drugs have moderate efficacy for reducing the frequency and duration of vasospastic episodes. [9] As of 2016,[update] their role more generally in Raynaud's was not clear. Sildenafil has shown some potential for improving exercise performance at high altitudes. However, its overall efficacy is not clear. Concomitant use of nitric oxide donors, organic nitrites and nitrates,[30] such as: nitroglycerinisosorbide mononitrateisosorbide dinitratesodium nitroprussidealkyl nitrites (commonly known as "poppers") Concomitant use of soluble guanylyl cyclase stimulators, such as riociguat Sildenafil should not be used if sexual activity is inadvisable due to underlying cardiovascular risk factors.

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