Take the container with you, even if it is empty. Patients taking Class 1A e. The interaction is a consequence of blocking hepatic metabolism of vardenafil by ritonavir, a highly potent CYP3A4 inhibitor, which also inhibits CYP2C9. Vardenafil is available on prescription, but it is only prescribed on the NHS for men with erectile dysfunction resulting from certain medical conditions. Before taking vardenafil Some medicines are not suitable for people with certain conditions, and sometimes a medicine may only be used if extra care is taken. Do not use any other medicine to treat impotence unless your doctor tells you to. If you feel the tablets are too strong for you, discuss this with your doctor as your dose may need to be reduced.Drugs & Medications. Levitra – Uses, Side Effects, and More. Generic Name (S): vardenafil. Uses. Side Effects. Precautions. Interactions. Overdose. Images. Reviews () Uses. Vardenafil is used.  · Generic name: VARDENAFIL HYDROCHLORIDE 5mg. Dosage form: tablet, film coated. Drug class: Impotence agents. Medically reviewed by test1.ru Last updated on General Dose Information. For most patients, the recommended starting dose of LEVITRA is 10 mg, taken orally, as needed, approximately 60 minutes before . LEVITRA (vardenafil HCl) is formulated as orange, film-coated round tablets with debossed “BAYER” cross on one side and “”, “5”, “10”, and “20” on the other side equivalent to mg, 5 mg, 10 mg, and 20 mg of vardenafil, respectively.