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You should not take any more than one sildenafil tablet in 24 hours. Do not take sildenafil if you are taking other medicines for ED. You can get an erection for up to 4 hours after taking sildenafil — meaning the ability to have an erection may last this long, but the actual erections will only last for a normal period of time. If you plan to use sildenafil, you should take it about an hour before planned sexual activity. For example, grapefruit can elevate blood levels of Viagra.

Stop taking sildenafil and call your doctor or call 111 straight away if you have a sudden decrease or loss of vision. If Viagra is deemed safe for you, your Viagra dose will be adjusted based on response, i.e., whether your erectile dysfunction improved, and tolerance, i.e., if you had any side effects. If you are taking sildenafil for erectile dysfunction, you are unlikely to miss a dose since this medication is taken as needed, not on a regular dosing schedule. This medication is sometimes prescribed for other uses