The antidote for morphine overdose is naloxone. This medication is used to reverse the effects of the overdose and a person may need to take many doses, as stated by MedlinePlus.
Morphine overdose can occur intentionally or accidentally. Whichever the case, it is necessary to seek immediate help to prevent the worsening of the symptoms. Some of the symptoms include pinpoint pupils, nausea, constipation, weak pulse, vomiting, difficulty breathing, drowsiness, low blood pressure and possible seizures. During a first aid, a victim should not be made to vomit unless instructed by a medical professional. Mouth-to-mouth breathing is necessary if a person stops breathing, as stated by MedlinePlus.