How and when to take sildenafil – NHS

2.4 Dosage Adjustments Due to Drug Interactions. Ritonavir. The recommended dose for ritonavir-treated patients is 25 mg prior to sexual activity and the recommended maximum dose is 25 mg within a 48 hour period because concomitant administration increased the blood levels of sildenafil by 11-fold [see Warnings and Precautions (), Drug Interactions (), and Clinical Pharmacology ()]. sildenafil tablets used for Maria Hudson. 4 hrs. ago. Anna Nelson. 6 hrs. ago. David Muldon. 8 hrs. ago Indications and Usage for Sildenafil Tablets. Adults. Sildenafil tablets are indicated for the treatment of pulmonary arterial hypertension (PAH) (World Health Organization [WHO] Group I) in adults to improve exercise ability and

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