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As with any medication containing vardenafil, Zhewitra 20 mg may cause side effects, though they are generally mild and temporary. Common side effects may include headache, flushing, upset stomach, nasal congestion, and dizziness. In rare cases, vardenafil may cause more severe side effects, such as changes in vision or hearing, chest pain, or an erection lasting longer than 4 hours (priapism). If you experience any severe side effects, it's essential to seek medical attention immediately.