Norethisterone dosage to delay period sildenafil is applied for the treatment of erectile dysfunction (impotence) in men and pulmonary arterial hypertension. Kamagra Oral Jelly is taken, as needed, approximately 1 hour before sexual activity. Do not take Kamagra Oral Jelly more than once a day. A high-fat meal may delay the time of the effect of this drug. Try not to eat grapefruit or drink grapefruit juice while you are being treated with Sildenafil. Super P-Force cannot be used in patients with allergy to the medication and its components and also in individuals treated with nitrates (such as nitroglycerin). This combination can cause very low blood pressure potentially dangerous to result in a stroke, heart attack, or death. Do not take this medication if you are under 18 y.o.