Levitra is available in the following dosages: 2.5 mg, 5mg, 10mg, and 20mg. Levitra comes in the form of orange tablets with a round shape. Normally, physicians start off patients with a 10mg dose. This roughly equal to a 50mg dose of Viagra or sildenafil.
Unlike longer-lasting Cialis, Levitra shares sildenafil's relatively short half-life. This means patients have to take the drug around one to two hours before they have sex. The maximum dosing frequency for this drug is once per day.
Levitra's compound, vardenafil, is also sold under the brand name Vivanza in the EU. Glaxo SmithKline is the pharmaceutical giant behind Vivanza. Levitra is available as a soluble tablet that dissolve on the patient's tongue. This form of Levitra is sold under the brand name Staxyn.
The common, adverse drug reactions (side-effects) are the same as with other PDE5 inhibitors. The frequent vardenafil-specific side-effect is nausea; the infrequent side-effects are abdominal pain, back pain, photosensitivity, abnormal vision, eye pain, facial edema, hypotension, palpitation, tachycardia, arthralgia, myalgia, rash, itch, and priapism.