Sold under “Miostat”, Carbachol is given as an injection into the patient’s eye to lower pressure in it “by increasing the amount of fluid that drains from the eye” (drugs.com) It is also used during ophthalmic surgery. In order to make sure that this medication will be safe for you, you should tell your doctor beforehand if you are using other drugs, or if you have allergies of any sort. You should also tell them if you are pregnant or breastfeeding, because in some cases, using Carbachol is deemed unsafe. Remember to be extremely cautious when you drive after taking this injection as it may cause blurred vision, and may even impair your thinking. When it comes to the other side effects of Carbachol, they include stomach cramps, tingly feeling, and headache. Don’t forget to call your doctor when you experience sudden vision problems, or urination problems.