This medicine which combines Carisoprodol and Aspirin is indicated for the treatment of painful muscular conditions. As for Carisoprodol, it is typically used to help muscles relax after muscle injuries or strains. Aspirin, on the other hand, is a famous painkiller and fever reducer that works by “reducing substances in the body that cause pain and inflammation”.(drugs.com). Bear in mind that you should not use this combination medicine if you are allergic to Aspirin or if you’re ever had a history of drug addiction, considering Carisoprodol can cause addiction when misused. Remember to tell your doctor if you are pregnant before using Carisoprodol-Aspirin combination, because Aspirin may harm your unborn baby during the last three months of pregnancy. Plus, it can even cause bleeding in both the mother and her baby during delivery. It is worth noting that Aspirin can also pass into breast milk, which may not be safe for the baby. So, make sure you tell your doctor if you are breastfeeding, too. As for the serious side effects of Carisoprodol-Aspirin combination medicine that should be heeded, they include stomach cramps, lightheadedness, depression, and seizures, among others. There are also other side effects that are less serious, albeit more common such as dizziness, headaches, rash, and nausea. On a side note, you should take your medicine four times per day, for three weeks.