Discovered in 1961, Ethambutol is an antibiotic that is used along with other medications to treat a number of infections including: tuberculosis, Mycobacterium avium complex, and Mycobacterium kansasii. Basically, this medication works by stopping the bacteria that cause tuberculosis from growing and increasing in numbers. It is worth noting that Ethambutol tablets are usually taken once daily with or without food. Bear in mind that you should have an eye test before starting treatment with this medicine, and then regularly while you are taking it. If you notice any changes in your vision during treatment, you should stop taking Ethambutol, and tell your doctor immediately so that your eyes can be checked. In other words, this medicine should be discontinued if any visual problems develop. As for the other potential side effects of Ethambutol, they include joint pain, nausea, headaches, and feeling tired. There are also other side effects that are more serious than the previous ones such as liver problems and allergic reactions. Remember that Ethambutol is not recommended in people with optic neuritis, significant kidney problems, or under the age of five. However, its use during pregnancy or breastfeeding has not been found to cause harm.