PDE-5 inhibitor: Cialis (tadalafil) has plenty of competitors eg Levitra, (vardenafil) Staxyn, Stendra & Viagra. All are readily available, although not necessarily cheap b/c none are generic as of yet. All require prescription as there are no OTC versions. Avoid online/overseas pharmacies b/c no guarantee that you'll get real thing. Avoid herbs & dietary supplements as manufacturers are not required to prove efficacy & safety
Answered 5/11/2015
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