Sildenafil citrate is a medication primarily used to treat erectile dysfunction and pulmonary arterial hypertension. The standard recommended dose for most adults is 50 mg, taken about an hour before sexual activity, and it can be adjusted based on effectiveness and tolerability up to a maximum of 100 mg per day. The 200 mg dose isn't typically recommended due to increased risk of side effects like headaches, flushing, dizziness, and changes in vision. It's important to consult a healthcare professional before taking any medication, especially at higher doses, to ensure safety and appropriateness for your specific health condition.