As a healthcare professional with expertise in pharmacology, I can provide you with information on the onset and duration of action for Viagra, which contains the active ingredient sildenafil. Viagra is used to treat erectile dysfunction (ED) in men, and its effectiveness can vary from person to person. **Generally, Viagra is thought to start working within around 30 minutes** after taking the drug, but the onset can be faster or slower depending on individual factors. It's important to note that **Viagra will not cause an erection on its own**; it works in response to sexual stimulation. In terms of duration, the effects of Viagra can last for up to 4 to 5 hours, which is the typical duration of action for the medication. However, the individual response may vary, and some men may experience effects that last longer or shorter than this timeframe. It's crucial to follow medical advice and read the patient information leaflet that comes with the medication to understand the correct usage and potential side effects. read more >>

How long does Viagra take to work? The effects of Viagra will vary from person to person. As a general rule, Viagra is thought to start working in most people from around 30 minutes after taking the drug. It is important to understand that taking Viagra tablets alone will not cause an erection.read more >>