Here are some...: Viagra, Levitra, (vardenafil) and Cialis all belong to PDE-5 inhibitors with same mechanism to enhancing erection of sponge bodies of penis or clitoris although coming with different onset of erection and profiles of side effects. As to possibly affecting blood pressure, they are similar; so exercise precautions and contraindications as recommended.
Answered 9/10/2015
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