While Tazzle 20 mg is generally well tolerated, some users may experience side effects, including:Common Side Effects: Headaches, flushing, nasal congestion, back pain, muscle aches, and indigestion. These side effects are usually mild and temporary, often resolving within a few hours.Serious Side Effects: Rare but serious side effects may include prolonged erections (priapism), sudden vision loss, or sudden hearing loss. If any serious side effects occur, seek immediate medical attention.