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Viagra is a well-known brand-name medicine containing Sildenafil. Sildenafil belongs to the phosphodiesterase type 5 (PDE5) inhibitor class and is used in the management of erectile dysfunction (ED).
Viagra was originally developed and marketed by Pfizer. It works by supporting increased blood flow during sexual stimulation.
| Product Name | Viagra |
| Active Ingredient | Sildenafil |
| Purpose | Erectile Dysfunction (ED) |
| Medicine Class | PDE5 Inhibitor |
| Form | Oral Tablet |
| Typical Onset | May begin working in approximately 30–60 minutes |
| Typical Duration | Approximately 3–5 hours |
| Manufacturer | Pfizer |
Sildenafil inhibits the PDE5 enzyme. This supports the action of cyclic guanosine monophosphate (cGMP), helping certain blood vessels relax and allowing increased blood flow during sexual stimulation.
Note: Viagra does not act as an aphrodisiac and generally requires sexual stimulation to produce its intended effect.
The effects of Sildenafil may last for approximately 3 to 5 hours, although onset, strength and duration can vary between individuals.
Possible side effects may include:
Seek urgent medical attention for serious symptoms such as chest pain, fainting, sudden severe vision changes, severe allergic reactions, or an erection that lasts unusually long.
| Medicine / Substance | Important Information |
| Nitrates and nitric oxide donor medicines | Combining these with Sildenafil can cause a dangerous drop in blood pressure. |
| Blood-pressure medicines | May increase the risk of dizziness or low blood pressure. |
| CYP3A4 inhibitors or inducers | May alter Sildenafil concentration and potentially affect its action or side effects. |
| Grapefruit products | May affect metabolism of some medicines and potentially increase side effects. |
Speak with a qualified healthcare professional before using Sildenafil if you have:
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