If you experience a sudden decrease or loss of vision, stop taking PDE5 inhibitors, including Levitra, and call a doctor right away. 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. Angina is a symptom of heart disease and can cause pain in your chest, jaw, or down your arm. Call your doctor if you get a side effect that bothers you or one that will not go away. Especially tell your doctor if you take any of the following: Ketoconazole or itraconazole such as Nizoral or Sporanox. Call your doctor for medical advice about side effects.Levitra is not a cure for ED and you still need to be aroused for the medication to work. Levitra and its generic version (vardenafil) are available in doses of: milligrams. 5 milligrams. Levitra is a prescription medicine taken by mouth for the treatment of erectile dysfunction (ED) in men. ED is a condition where the penis does not harden and expand when a man is sexually excited, or when he cannot keep an erection. A man who has trouble getting or keeping an erection should see his doctor for help if the condition . · Levitra works by increasing blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection. Levitra is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Levitra does not cure erectile dysfunction or increase sexual desire.