Ethambutol is best taken on an empty stomach, 1 hour before breakfast. Do take the full dosage of 2-3 pills at the same time- do not divide the dosage throughout the day.
Lab tests- a CBC( cell blood count) and a Biochemistry panel should be done monthly, especially checking for liver function.
It is important to be under the care of an ophthalmologist or a neuro- owhile on Ethambutol. It is recommended to read small print daily- if blurry vision occurs two days in a row- stop the Ethambutol and see your ophthalmologist as soon as possible.
( NTM Patient Course, Management of Medication Side Effects, Dr. Gwen Huitt)