Drug information provided by: Micromedex

If your symptoms do not improve within a few days, or if they become worse, check with your doctor.

Colistimethate injection may cause some people to become dizzy or to have numbness and tingling sensations in the hands, toes, and feet. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are dizzy or do not have normal feelings in your hands and feet. If these symptoms are especially bothersome, check with your doctor.

Serious breathing problems may occur after you get a shot of this medicine into one of your muscles. Call your doctor right away if you or your child have any change in your breathing after you receive this medicine.

Colistimethate injection may cause diarrhea, and in some cases it can be severe. Do not take any medicine to treat diarrhea without first checking with your doctor. Diarrhea medicines may make the diarrhea worse or make it last longer. If you have any questions about this or if mild diarrhea continues, or gets worse, check with your doctor.

Stop using this medicine and check with your doctor right away if you or your child have bloody urine; a decrease in frequency or amount of urine; an increase in blood pressure; increased thirst; loss of appetite; lower back or side pain; nausea; swelling of the face, fingers, or lower legs; troubled breathing; unusual tiredness or weakness; vomiting; or weight gain.