These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Safety of combined use of PDE5 inhibitors and alpha-blockers may be affected by other variables, including intravascular volume depletion and other anti-hypertensive drugs. Why is there a need for another pill? 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. Make sure to get an estimate of when you can expect your prescription in the mail.Levitra 20 mg tablet Medication name Uses How to use Side effects Precautions Drug interactions Overdose Notes Missed dose Storage Important note Information last revised August Copyright (c) First Databank, Inc. Selected from NATIONAL DRUG DATA FILE (NDDF) data included with permission and copyrighted by First Databank, . Levitra generics Generic Levitra is typically sold as vardenafil hydrochloride or just vardenafil. In some cases, generic forms of Levitra can be half the cost or more of the brand-name. Vardenafil HCl is a nearly colorless, solid substance with a molecular weight of g/mol and a solubility of mg/mL in water. LEVITRA is formulated as orange, round, film-coated tablets with “BAYER” cross debossed on one side and “”, “5”, “10”, and “20” on the other side corresponding to mg, 5 mg, 10 mg, and.