Like any medication, Cenforce 100 mg may cause certain side effects, although not everyone experiences them. Common side effects may include headache, dizziness, flushing, nasal congestion, indigestion, and blurred vision. These effects are usually mild and transient. However, in rare cases, individuals may experience more severe side effects such as priapism (prolonged erection), sudden vision or hearing loss, or allergic reactions. If any unusual or persistent side effects occur, it is crucial to seek medical attention immediately.