CPM 4mg Injection is an anti-allergic medication used in the treatment of various allergic conditions. It works by blocking the action of histamine and provides relief from symptoms such runny nose, sneezing, itching, skin rashes, and watery eyes. The most common side effect of this medicine is drowsiness. Other side effects include the inability to concentrate, lethargy, blurred vision, nausea, vomiting, and diarrhea. Avoid driving or activities that need a lot of attention while taking this medicine. If any of the side effects bother you, let your doctor know. There may be ways of reducing or preventing them. The most common side effect of this medicine includes burning at the site of application, dizziness, nausea, and vomiting. Avoid driving or attention-seeking activity. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. In some cases, it may cause dryness of mouth, so it is advised to drink more water, always carry sugar candy or maintain oral hygiene. Before taking this medicine, let your doctor know if you have glaucoma or have any gastro related issues, or have high blood pressure. Inform your doctor if you are pregnant, or breastfeeding. Your doctor should also know about all other medicines you are taking as many of these may make this medicine less effective or change the way it works. Generally, it is advised to avoid alcohol while on treatment.