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Selectivity is the ability of the drug to attach to the specific enzyme PDE 5 found in penile tissues. Vardenafil (Levitra) is more selective than sildenafil and tadalafil (Cialis) to PDE5, which again means a lower dose is needed with potentially less side effects. Tadalafil is very specific for PDE5 and is also very specific for the enzyme PDE11. Unfortunately, we don’t know much about PDE11, which is found in the heart, in the pituitary gland in the brain and in the testicles. Pharmacokinetics, half-life, is how long the medication stay s in the blood. Sildenafil (Viagra) has a half-life of 4 hours and vardenafil (Levitra) has a half-life of 4-6 hours while tadalafil (Cialis) has a half-life of 17.5 hours.

Patients taking recreational "poppers," including amyl nitrate, amyl nitrite, and butyl nitrate, should not take ED medication. Speak to your doctor or pharmacist about other drug interactions to ensure safety when taking your ED meds. For US consumers, Canadian Cialis has already become synonymous with the quality of the original drug. Mostly Canadian manufacturers offer classic pills in dosages of 2.5, 5, 10 and 20 mg. Initially benign, BPH may require surgery or develop into a malignant tumor of the prostate in an advanced course. To prevent this development of events, it is extremely important to start conservative treatment of BPH on time.

100mg might be the best dosage for you if you tried 50mg and it didn’t work for you, and you didn’t get any side effects. Viagra 50mg is the standard starting dose for most people, and is what we recommend if you’ve never tried Viagra before. 50mg is the most popular dosage of Viagra, and is effective for most men who try it. By taking treatment for erectile dysfunction you may experience