Levitra has shown possible side effects when interacting with some drugs. Consult your doctor if you’re taking any of the following: other PDE-5 inhibitors, nitrates, diuretics, antifungals, alpha-blockers, calcium channel blockers, chemotherapy or autoimmune condition drugs. Common side effects of Levitra include: headache, flushing (warmth or redness in your face, neck, or chest), runny or stuffy nose, stomach upset, heartburn, dizziness, back pain, or nausea. In the rare event you have a painful or prolonged erection lasting 4 or more hours, stop using Levitra and get medical help right away. Tell your doctor if you have serious side effects including sudden vision loss; ringing in your ears, or sudden hearing loss; chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling; irregular heartbeat; swelling in your hands, ankles, or feet; shortness of breath; vision changes; lightheadedness, fainting; or seizures (convulsions).

Levitra should only be taken when needed, about an hour before any sexual activity. Note that an erection doesn’t occur by merely taking the pill. Levitra ensures genital arousal when physical stimulation occurs. A possible side effect is a prolonged or painful erection; if this happens, consult your doctor. Other possible side effects include headaches, dizziness, and pain in the stomach or lower back, if you experience any of these, contact your doctor.