A few more interesting comparisons...
The side effect profiles are similar among the three drugs (headaches, nasal congestion, flushing). Blue discoloration of vision is seen only with
Viagra (<0.5%) and muscle aches only with
Cialis (~5%).
Cialis has a half-life of 17.5 hours so stays active in the body much longer than the other two drugs 24â36 hoursâcompared to 4â5 hours for Viagra and
Levitra. Cialis has earned the nickname âweekender,â as a single dose taken on Friday would still be exerting an effect Sunday (or even Monday)!
Levitra may work fasterâ 25â30 minutes compared with an hour for Viagra.
Viagra / Cialis / Levitra must not be taken if you are using a nitrate drug for chest pain or heart problems. Nitrates include nitroglycerin (Nitrostat, Nitrolingual, Nitro-Dur, Nitro-Bid, Minitran, Deponit, Transderm-Nitro, others),
isosorbide dinitrate (Dilatrate-SR, Isordil, Sorbitrate), and isosorbide mononitrate (Imdur, ISMO, Monoket). Nitrates are also found in some recreational drugs such as amyl nitrate or nitrite ("poppers").
Additional information on these drugs available at
http://viagra.drugs.com/ http://levitra.drugs.com http://cialis.drugs.com