Taking sildenafil once a week is generally safe and well-tolerated for long-term use. There is no medical evidence suggesting that it causes permanent damage to your sexual health or physical dependency. Most potential side effects, like mild headaches, flushing, or indigestion, are temporary and occur shortly after taking the dose. However, because erectile function is closely linked to cardiovascular health, it is important to have regular check-ups with your doctor to monitor your heart and blood pressure. As long as you do not take nitrates for chest pain and your overall health remains stable, you can continue using this medication safely.