Zenegra 100 mg, which contains sildenafil citrate (the same active ingredient as Viagra), is primarily used to treat erectile dysfunction (ED) in men. While it can be effective, like all medications, it may cause side effects. The side effects of Zenegra 100 mg can vary from mild to more serious reactions. Here’s an overview: Common Side Effects: These are usually mild and go away as your body adjusts to the medication: Headache: One of the most common side effects. Flushing: Redness or warmth in the face, neck, or chest. Indigestion or upset stomach. Nasal congestion: Blocked or stuffy nose. Dizziness: Light-headedness or feeling faint. Back pain: Some users report muscle or back discomfort. Visual disturbances: Temporary changes in vision, such as a blue tinge or blurred vision. This is a rare side effect. Less Common and More Serious Side Effects: Seek medical help if you experience any of these: Priapism: A prolonged erection lasting more than 4 hours, which can cause damage to the ***** if not treated immediately. Chest pain or discomfort: If you experience chest pain, it’s important to stop the medication and seek emergency medical attention. Sudden vision loss or visual impairment: This could be a sign of a serious condition called non-arteritic anterior ischemic optic neuropathy (NAION), which can lead to permanent vision loss. Hearing loss or ringing in the ears (tinnitus). Shortness of breath or irregular heartbeat: These could indicate a more serious cardiovascular reaction. Severe dizziness or fainting: Could indicate low blood pressure or another serious issue. Rash: Uncommon, but possible. Rare and Severe Reactions: Severe allergic reactions: Symptoms may include swelling of the face, lips, tongue, or throat, difficulty breathing, or a rash. This requires immediate medical attention. Contraindications and Warnings: Heart Conditions: If you have a history of heart disease, recent stroke, or low blood pressure, you should consult your doctor before using Zenegra, as it can lower blood pressure. Nitrates: If you are using any nitrate medications (e.g., for chest pain), you should not take Zenegra, as combining them can cause a dangerous drop in blood pressure. What to Do If You Experience Side Effects: For mild side effects like headache or flushing, you may not need to stop taking Zenegra, but you should inform your healthcare provider. For serious side effects like priapism, chest pain, or sudden vision or hearing loss, seek emergency medical help immediately.