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Sildenafil dosage for ED ranges from 25 mg to 100 mg. The most commonly prescribed dose is 50 mg, but can be adjusted based on patient results. It should not be taken more than once a day and should be taken 4 hours before sexual intercourse. It works within 30-60 minutes. 

However, if you have certain pre-existing conditions or are taking other medications, your doctor may recommend that you take Sidegra less often than once a day. It may not be safe to take Sidegra if you take nitrate medications commonly used to relieve chest pain, as the combination of these medications can cause your blood pressure to drop dangerously low. 

For PAH, tablets are available in 10 mg and 20 mg strengths. Typical adult dosage is 20 mg, taken 10 times a day, and children’s dosage ranges from 20-20 mg, taken up to 20 times a day, depending on their weight. If you forget, you should take Sidegra as soon as you remember, unless it is close to your next scheduled dose, in which case you should wait for your next dose. You should never take two doses at the same time to make up for a missed dose. 

Always take Sidegra as prescribed by your doctor or pharmacist. 

Sildenafil can be taken with or without food. However, if you take Sidegra to treat erectile dysfunction, take it with food (especially fatty foods), which can slow down the effects of the medicine. Additionally, if used to treat PAH, sildenafil should not be taken with grapefruit juice because it can affect the effectiveness of the medication.