Drug Uses Apcalis SX is a jelly solution that is used in the treatment of male erectile dysfunction, also known as impotence. Usage In most cases the dosage should not increase more than once in a day (24 hours). For people who consume protease inhibitors (used in treatment of HIV), the dosage should not be more than a single dose of 25 mg of Apcalis SX within 48 hours. Drug Class and Mechanism Apcalis SX helps to increase the blood flow into the penis thereby enabling a stronger erection. More blood flows into the organ while less flows out thus enlarging the arteries. This helps to achieve stronger erection. Missed Dose Despite your best attempts at remembering, if you still miss out on a dose, then take it as soon as you remember about it. But keep in mind that you will have to adjust your next dose by spacing it out by 4 to 5 hours. If this is not possible, then the best thing to do would be to skip the missed dose and continue with your normal dosage schedule. Never try to compensate for the missed dose by taking a double dose together. It may cause adverse effects. Storage Store Apcalis SX at room temperature 15-30 degrees C (59-86 degrees F).