Levitra is the brand name of the drug vardenafil. It is sold by prescription only and is used to treat erectile dysfunction.
Forty mg of Levitra is twice the maximum recommended daily dose, and four times the average dose prescribed by doctors. Symptoms of an overdose of the drug include back pain, muscle pain or vision problems.
Drugs that are known to cause serious, even life-threatening interactions with Levitra include nitrates, nitric oxide and amyl or butyl nitrite (poppers). There is a long list of drugs that might react with Levitra, so it's best to consult with your doctor about what is safe.
The most common side effects are headache, hot flashes, nasal congestion and indigestion. Higher dosages of Levitra can cause side effects such as anaphylactic reaction, sudden decrease or loss of hearing, chest and abdominal pain, abnormal vision, abnormal ejaculation and prolonged or painful erections.
Alcohol can increase the side effects of Levitra. Also, grapefruit or grapefruit juice may interact with the drug.
Levitra can cause a drop in blood pressure to the eye and partial or complete loss of vision. Ask your physician if you should drive while being treated with this drug.