The major product of metabolisation by these

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[50] Overall, this results in a decrease in intracellular calcium and desensitizing proteins to the effects of calcium, engendering smooth muscle relaxation. The molecular structure of sildenafil is similar to that of cGMP and acts as a competitive binding agent of PDE5 in the corpus cavernosum, resulting in more cGMP and increased penile response to sexual stimulation. [49][51] Without sexual stimulation, and therefore lack of activation of the NO/cGMP system, sildenafil should not cause an erection. Other drugs that operate by the same mechanism include tadalafil (Cialis) and vardenafil (Levitra). Sildenafil is broken down in the liver by hepatic metabolism using cytochrome p450 enzymes, mainly CYP450 3A4 (major route), but also by CYP2C9 (minor route) hepatic isoenzymes. enzymes is N-desmethylated sildenafil,

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which is metabolised further.

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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.

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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. [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. Patients thus taking the drug may experience colorvision abnormalities. This metabolite also has an affinity for the

  • Sildenafil can cause side effects like dizziness and headaches.
  • Always check for allergic reactions before use.
  • OTC options should be used with caution in high-risk groups.
  • Be skeptical of claims promising instant results.
  • Use according to the recommended dose to prevent side effects.
  • OTC sildenafil may be included in online "male enhancement" products.
  • Consult reviews and user feedback before purchasing.
  • Beware of extra charges or hidden fees in OTC purchases.
  • Keep track of your body's response to medication.
  • Avoid alcohol to reduce side effects when using sildenafil.
  • Seek medical help if severe adverse reactions occur.

PDE receptors, about 40% of that of sildenafil.

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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. Sildenafil's popularity with young adults has increased over the years. [32] Sildenafil's brand name, Viagra, is widely recognized in popular culture, and the drug's association with treating erectile dysfunction has led to its recreational use. [33] The reasons behind such use include the belief that the drug increases libido, improves sexual performance,[33] or permanently increases penis size. [34] Studies on the effects of sildenafil when used recreationally are limited, but suggest it has little effect when used by those who do not have erectile dysfunction.

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In one study, a 25 mg dose was shown to cause no significant change in erectile quality, but did reduce the postejaculatory refractory time. [35] This study also noted a significant placebo effect in the control group. Unprescribed recreational use of sildenafil and other PDE5 inhibitors is noted as particularly high among users of illegal drugs. [36] Sildenafil is sometimes used to counteract the effects of other substances, often illicit. [33] Some users mix it with methylenedioxymethamphetamine (MDMA, ecstasy), other stimulants, or opiates in an attempt to compensate for the common side effect of erectile dysfunction, a combination known as "sextasy", "rockin' and rollin'", "hammerheading", or "trail mix". Thus, the metabolite is responsible

Country OTC Availability Regulations Summary Date of Legal Change Notes
USA No Prescription required, OTC status not approved N/A FDA approved for prescription use
UK Yes Sold as a supplement in some stores, regulated as medication in pharmacies 2020 Limited to specific brands
Australia No Prescription only N/A Strict regulation
Germany Yes Over-the-counter sale available in pharmacies 2018 Age restrictions apply

for about 20% of sildenafil's action.

  • Sildenafil's patent expired, leading to generic OTC options.
  • OTC sildenafil may have different dosing guidelines.
  • Be aware of expiry dates on over-the-counter products.
  • Pharmacists can provide advice on safe use of OTC sildenafil.
  • Some OTC products include additional herbal ingredients.
  • OTC sildenafil is often marketed as a libido booster.
  • Consult a healthcare provider before beginning OTC treatment.
  • It's essential to distinguish between authorized and illegal sales.
  • OTC sildenafil is not suitable for minors.
  • Keep sildenafil out of reach of children.
  • Proper storage ensures medication potency over time.

Sildenafil is excreted as metabolites predominantly in

  • Speed of effect varies depending on individual health and food intake.
  • OTC sildenafil is often marketed with emphasis on privacy.
  • Remember that natural or herbal products are not always safe.
  • Be aware of side effects like vision flickering or color changes.
  • Always consult a healthcare provider if you experience adverse effects.
  • OTC sildenafil does not treat underlying health conditions.
  • Cost varies significantly between brands and sources.
  • Use only FDA-approved or certified OTC products.
  • OTC sildenafil should not be combined with other ED medications.
  • Watch for counterfeit products in online marketplaces.
  • Proper consultation can prevent potential drug interactions.

the feces (about 80% of administered oral dose)

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[33] Mixing it with amyl nitrite, another vasodilator, is particularly dangerous and potentially fatal. The 2007 Ig Nobel Prize in aviation went to Patricia V. Agostino, Santiago A. Plano, and Diego A. Golombek of Universidad Nacional de Quilmes, sildenafil oral jelly 100 mg Argentina, for their discovery that sildenafil helps treat jet lag recovery in hamsters.

36 HRS

Professional athletes have been documented using sildenafil, believing the opening of their blood vessels will enrich their muscles. In turn, they believe it will enhance their performances. Acetildenafil and other synthetic structural analogs of sildenafil which are PDE5 inhibitors have been found as adulterants in a number of "herbal" aphrodisiac products sold over-the-counter. [41] These analogs have not undergone any of the rigorous testing that drugs like sildenafil have passed, and thus have unknown side-effect profiles. [42] Some attempts have been made to ban these drugs, but progress has been slow so far, as, even in those jurisdictions that have laws targeting designer drugs, the laws are drafted to ban analogs of illegal drugs of abuse, rather than analogs of prescription medicines. and to a lesser extent in the

When to see a doctor about ED

Some complained of blurriness and loss of peripheral vision. 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. "[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. Rare but serious adverse effects found through postmarketing surveillance include prolonged erections, severe low blood pressure, myocardial infarction (heart sildenafil pick up attack), ventricular arrhythmias, stroke, increased intraocular pressure, and sudden hearing loss. [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.

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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. [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. urine (around 13% of the administered oral dose).

Brand Name Recommended Dose Timing Before Sexual Activity Max Daily Dose Note
Sildenafil Max 50 mg 30-60 minutes 100 mg Take on an empty stomach for faster effect
Virexol 25 mg 30 minutes 50 mg Do not exceed twice daily
PowerErect 100 mg 15-30 minutes 100 mg Use with caution in elderly patients
Erosol 50 mg 30-60 minutes 100 mg Can be taken with or without food

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