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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]
Sildenafil is most commonly prescribed to be taken one time per day in doses between 25 and 100 mg for ED. Your healthcare provider will determine the best dosage for you based on a number of factors.
The expiration date of pharmaceuticals specifies the date the manufacturer guarantees the full potency and safety of a drug. Most medications continue to be effective and safe for a time after the expiration date. A rare exception is a case of renal tubular acidosis purportedly caused by expired tetracycline. [9]
Viagra (or sildenafil) lasts three to five hours after it’s consumed. Cialis (tadalafil) has a half-life of 17.5 hours, meaning this drug lasts up to 36 hours after it’s consumed.
Viagra usually starts working 30 to 60 minutes after taking it. But simply swallowing the little blue pill won’t automatically make you hard — you still have to be aroused, either through ...
Expiration dates for infant formula should not be ignored. [6] If formula is stored too long, it may lose its nutritional value. [6] The expiration date of pharmaceuticals specifies the date the manufacturer guarantees the full potency and safety of a drug. Most medications continue to be effective and safe for a time after the expiration date.
Side Effects and Risks of Taking Viagra without ED. There’s not much research about the long-term dangers of taking ED meds recreationally, but there's more than enough information available ...
Vardenafil's indications and contraindications are the same as with other PDE5 inhibitors; it is closely related in function to sildenafil citrate (Viagra) and tadalafil (Cialis). The difference between the vardenafil molecule and sildenafil citrate is a nitrogen atom's position and the change of sildenafil's piperazine ring methyl group to an ...