1 doctor weighed in:

If i take viagra (sildenafil) 50mg aftar two hours not working cand i add after the 2 hours anther 50mg?

1 doctor weighed in

In brief: Yes

Assuming that you have received appropriate stimulation and have not resulted in full tumescence, then yes; it should be safe to add an additional 50 mg (100 mg maximum recommended dose) of sildenafil in 24 hours.

In brief: Yes

Assuming that you have received appropriate stimulation and have not resulted in full tumescence, then yes; it should be safe to add an additional 50 mg (100 mg maximum recommended dose) of sildenafil in 24 hours.
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