Hey man! If I take a kamagra (generic viagra) I take max 50 mg (half a pill) in the evening and I don't have to take another in the morning. The effect is not as good in the morning but it works ok. If it's over 12 hours after I took the pill I might have to take another to keep going. But I never take two pills a day nowadays, I don't like the strong blushing I always get and a blocked nose doesn't help either.