Hi there ~ I understand your concerns regarding levofloxacin. Levofloxacin comes as a tablet and a solution (liquid) to take by mouth. It is usually taken once a day. The length of your treatment depends on the type of infection you have. Your doctor will tell you how long to take levofloxacin. The tablet may be taken with or without food. The solution should be taken 1 hour before or 2 hours after eating. Take levofloxacin at around the same time every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take levofloxacin exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor. You should begin to feel better during the first few days of treatment with levofloxacin. If your symptoms do not improve or if they get worse, call your doctor. Regarding the caution about Myasthenia Gravis, stop taking the medication if you have any symptoms that are on the label (about adverse effects) after taking the medications and call you doctor or wait to see him the following day. I hope this helps. Take care and have a lovely day!