If you're experiencing an allergic reaction to Zhewitra 60 mg (which contains vardenafil), signs to watch for include difficulty breathing, swelling of the face, lips, tongue, or throat, severe dizziness, or a rash. These symptoms can indicate a serious allergic reaction called anaphylaxis, which requires immediate medical attention. Other milder symptoms might include itching, redness, or hives on the skin. In rare cases, you may experience visual disturbances or changes in your vision, which could also be linked to the medication. If any of these signs occur, contact a healthcare provider right away. Always report any unusual reactions to your doctor for proper evaluation.