If you have sickle cell disease. If you have ever had bone marrow cancer or leukaemia. This is not a complete list of side effects and others may occur. Other CYP3A4 inhibitors: Although specific interactions have not been studied, other CYP3A4 inhibitors, including grapefruit juice would likely increase vardenafil exposure. In vivo studies: Cytochrome P Inhibitors Cimetidine mg b. B No evidence of risk in humans Based on FDA pregnancy categories Vardenafil is not approved for use in women, and the effects of this medicine during pregnancy or in breastfeeding women are unknown. If you have ever had an allergic reaction to a medicine.In combination with sexual stimulation, vardenafil works by increasing blood flow to the penis to help a man get and keep an drug does not protect against sexually transmitted. Vardenafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). In combination with sexual stimulation, vardenafil w. Levitra, known by the generic name vardenafil hydrochloride, is an erectile dysfunction (ED) medication first manufactured by the German company Bayer Pharmaceuticals in as a competitor to.