Adverse Effects of Rifampicin

Common and Serious Side Effects

The American Thoracic Society recommends monitoring liver enzymes, especially in patients with underlying liver disease, elderly patients, or those consuming alcohol, due to the risk of hepatotoxicity 3
The American College of Chest Physicians suggests that rifampicin can cause orange discoloration of body fluids, which can permanently stain soft contact lenses and clothing, although this fact is from a less preferred source, a better source indicates 2 is less reliable, a more reliable source is not available for this fact
The European Respiratory Society notes that rifampicin is a potent inducer of hepatic microsomal enzymes, particularly CYP3A4, and can significantly reduce the effectiveness of many medications, including hormonal contraceptives, methadone, warfarin, and cyclosporin 4
The American Journal of Respiratory and Critical Care Medicine recommends regular monitoring of liver enzymes and complete blood count to minimize the risk of adverse effects, particularly in elderly patients who may require dose adjustment due to increased risk of adverse effects 1

The European Respiratory Society advises that rifampicin accelerates the metabolism of various medications, including hormonal contraceptives, methadone, and warfarin, which may lead to reduced effectiveness or increased risk of adverse effects 4
The American College of Chest Physicians recommends monitoring liver function and complete blood count in patients taking rifampicin, especially those with underlying liver disease or elderly patients, to minimize the risk of hepatotoxicity and other adverse effects 3
The Centers for Disease Control and Prevention suggest that patients should be advised to immediately report symptoms such as unusual fatigue, anorexia, nausea, vomiting, dark urine, or jaundice, which may indicate liver toxicity, and to seek immediate medical attention if experiencing shortness of breath, unusual bleeding, or severe skin reactions 5, 6