Tazzle 10 mg (which contains tadalafil) can cause dizziness or fainting as potential side effects, although these are not very common. Why does this happen? Tadalafil works by relaxing blood vessels to improve blood flow, which can sometimes lead to a drop in blood pressure. This drop in blood pressure can cause dizziness, lightheadedness, or even fainting, especially when standing up quickly (orthostatic hypotension). What to do: If you experience dizziness or fainting after taking Tazzle, avoid sudden movements like quickly standing up. Do not drive or operate heavy machinery if you feel dizzy. Inform your doctor immediately if dizziness or fainting happens, as it may indicate a more serious problem or the need to adjust your dosage. Who is more at risk? People with existing heart problems, low blood pressure, or those taking medications that lower blood pressure are more prone to these side effects. If you have any concerns or symptoms like this, it's best to consult your healthcare provider for advice tailored to your health status.