Physicians should inform their patients that in some patients concomitant use of PDE5 inhibitors, including LEVITRA, with alpha-blockers can lower blood pressure significantly leading to symptomatic hypotension e. Physicians should inform patients that there have been rare reports of prolonged erections greater than 4 hours and priapism painful erections greater than 6 hours in duration for LEVITRA and this class of compounds. Read our editorial process. Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. When taken at the correct time and paired with sexual stimulation, the erection lasts long enough for successful intercourse. In vivo studies: Cytochrome P Inhibitors Cimetidine mg b. If pills fail, there are vacuum devices, Muse, injections, bypass surgery and implants.Vardenafil (Levitra) is almost 10 times more biochemically potent than sildenafil, therefore a lower dose is needed to facilitate the penile erection, potentially resulting in less side effects. 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. Vardenafil (Levitra): Uses, Alternatives, Side Effects & More – GoodRx. feeling faint or weak, dizziness, blurry vision, feeling confused. Erection lasting for more than 4 hours. Headache (up to 15%) Flushing (up to 11%) Stuffy nose (up to 9%) Indigestion (up to 4%) —skin rash,, swelling of the face, lips, tongue, or throat. You can buy this drug under the common brand name Vardenafil. Who should take Levitra? Levitra is used to treat erectile dysfunction, also known as impotence. It is .