SR tablets (Sustained Release) and regular tablets are different in how they release medicine in your body. Regular tablets work quickly, so you feel relief sooner, but the effect does not last as long. SR tablets release medicine slowly over several hours, so the effect lasts longer and you may not need to take them as often. SR tablets are helpful when your body needs a steady amount of medicine, like for long-term conditions. You should not switch between SR and regular tablets unless your doctor tells you to, because the dose and how they work are different. Do not break or crush SR tablets, as this can change how they work. Both types can have similar side effects depending on the medicine, but SR tablets may sometimes cause fewer side effects because they release the drug slowly. The best option depends on your condition, how your body reacts, and your doctor?s advice. Always use the form your doctor prescribes, and do not switch between SR and regular tablets on your own.