There has not been any major testing done to determine the side effects of bacopa monnieri, but most people have reported no side effects or very minimal side effects when taking bacopa for short periods of time.
Minor side effects that have been reported include dry mouth, excessive thirst, fatigue, and nausea.
People with heart conditions should consult with a physician before taking bacopa because it can cause irregular heartbeat.
If you have diabetes, ask your doctor first before taking bacopa because it may affect your glucose and insulin levels. Be sure to monitor your blood sugar levels closely if you and your doctor decide that it is safe for you to take.
People with disorders that predispose them to bleeding should not take bacopa before undergoing surgery or dental work.
People taking thyroid medication or calcium blockers should not take bacopa.
People taking antidepressants or antipsychotics that are metabolized by cytochrome P450 enzymes (Zoloft and Lustral are two such drugs) should not take bacopa because it interferes with the metabolization and elimination of the drugs which can lead to overdose.