How Long Does Viagra Last? – Healthline Applies to: Metoprolol Tartrate (metoprolol) and sildenafil Sildenafil can add to the blood pressure-lowering effect of metoprolol. Contact your doctor if you experience signs and symptoms of low blood pressure such as dizziness, lightheadedness, fainting, flushing, headache, or a rapid pulse or heart rate. Sildenafil (Viagra) is used […]