Rifampicin refers to rifampicin eye drops. Whether or not it is useful to use rifampicin eye drops for bloodshot eyes depends on the cause of the bloodshot eyes, and it is impossible to generalize. If the bloodshot eyes are caused by conjunctivitis or keratitis, it is useful to use rifampicin eye drops if it is caused by allergic bacteria because rifampicin eye drops can treat some infectious conjunctivitis and keratitis. If the blood in the eyes is caused by dry eye or eye allergies, the use of rifampicin is useless, because rifampicin does not have the effect of treating dry eye or eye allergies, which is typical of the drug is not right for the symptoms. Adverse effects of rifampicin eye drops include headache, fever, dizziness and so on. Contraindications to Rifampicin Eye Drops include those who are allergic to the ingredients of the drug; patients with severe hepatic insufficiency; patients with biliary tract obstruction, etc. It is not recommended that patients with bloodshot eyes use the drug privately, and they need to consult a doctor for examination and use the drug under the guidance of a professional doctor.