Here are some of the common and less common side effects associated with these medications: Common Side Effects: Headaches Facial Flushing Indigestion or upset stomach Nasal congestion Back pain (more commonly associated with Cialis) Muscle aches (more commonly associated with Cialis) Dizziness Less Common Side Effects: Blurred vision or changes in color vision Sensitivity to light Rash Nausea Low blood pressure (hypotension) Prolonged erections (priapism), which require immediate medical attention Sudden hearing loss – this is rare but requires immediate medical attention. Serious Side Effects: These are rare but require immediate medical attention: Chest pain or irregular heartbeat Shortness of breath Swelling in the hands, ankles, or feet Seizures If you experience any severe or persistent side effects, it’s crucial to seek medical attention immediately.