Common side effects may include headache, flushing, upset stomach, nasal congestion, dizziness, and changes in vision (such as blurred vision or increased sensitivity to light). These side effects are usually mild and temporary. Serious side effects such ... moreCommon side effects may include headache, flushing, upset stomach, nasal congestion, dizziness, and changes in vision (such as blurred vision or increased sensitivity to light). These side effects are usually mild and temporary. Serious side effects such as prolonged erection (priapism) or sudden vision loss are rare but require immediate medical attention.
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