Grapefruit may interact with vardenafil and lead to unwanted side effects. Official answer: The effects of Levitra last for about 4 hours. Levitra is taken only An erection will not occur just by taking a pill. The link below. Find a comprehensive guide to possible side effects including common and rare side effects when taking Levitra (Vardenafil HCl) for healthcare professionals.
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Erectile Dysfunction Drugs-Mayo Clinic
What are the side effects of taking levitra? - valuable