Xenical how it works try not to eat grapefruit or drink grapefruit juice while you are being treated with Sildenafil. Consult with your doctor before using. Use no more than was prescribed. Take it orally, generally three times daily during (or up to one hour after) each main meal that contains fat. You should take a multivitamin addition including vitamins A, D, E, and K to ensure good supply. The addition should be taken at least two hours before or after you take this medication, such as before going to bed. The recommended dose for adults and children under 12 years is one 120-milligram capsule 3 times daily. Note: this instruction presented here just for review. It’s very necessary to consult with your doctor before using. It helps you to get the best results. 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.