Levitra (vardenafil hydrochloride) is a prescription drug that belongs to the class of PDE5 inhibitors and works to improve the hardness and stability of erections by stimulating blood flow to the tissues of the penis. Levitra can be taken by men of any age, although some of them may need a higher or lower dose depending on certain medical conditions they have been diagnosed with. Some drugs you are taking at the moment of starting the treatment with Levitra are also important to mention, especially if you are using isoniazid, imatinib, heart or blood pressure medications, diclofenac, drugs to treat high blood pressure, heart rhythm medicines, HIV/AIDS medicines, antidepressants, drugs for prostate disorder, antifungal medications, conivaptan, or antibiotics. Levitra side effects include flu-like symptoms, headache, stuffy or runny nose, heartburn, upset stomach, and flushing. Remember that Levitra is not a cure rather than a treatment, so you will need to take it for as long as you want it to help you get stable erections. Avoid drinking grapefruit juice when taking Levitra, as it has been reported to interact with the effects of this medicine.