A lot of medications take time to start working in your body, so you should not expect to see results immediately. Often it will take a few days, or even weeks in some cases, before a medication reaches its full effect. Ask your doctor or pharmacist how long you should expect it to take for your medication to start working and contact them if you feel like it is not working after that time has passed. Additionally, many medications should not be stopped abruptly and need to be tapered off slowly to avoid adverse effects, so always contact your doctor or pharmacist before stopping a medication. – Megan Herman, HIV Ambulatory Clinical Pharmacist