Original sentence: A commonly prescribed antiobiotic, minocycline, has now been found by several studies to be very effective in the treatment of multiple sclerosis.A study at the University of Calgary found great reduction in new lesions over the course of treatement, far below pre-treatment levels.It was found to worsen symptoms of amyotrophic  lateral sclerosis, but researchers cautioned that is an entirely different disease and the problems with ALS patients and minocycline should not prevent it's use in multiple sclerosis.Minocycline is widely regarded as safe for normal adults, but should be taken under a doctor's care ideally because safety for patients with some brain abnormalities is not known