The common side effects of Demerol are similar to other narcotics, impairment of performance. Driving or operating heavy machinery is unwise, as Demerol can interfere with mental and physical abilities. Common Demerol side effects: are constipation, dizziness, dry mouth, headache, itching, nausea, sedation, sweating, vomiting, or weakness. If you feel lightheaded or nauseous, lying down may alleviate these symptoms.

Other side effects of Demerol effect the users breathing. It can cause breathing irregularity or other respiratory depression. Respiratory depression is the most serious likely side effect of Demerol, and may be more likely with certain combinations of medication.

A list of common side effects due to Demerol include:

• Dizziness
• Lowered blood pressure
• Shallow breathing, shortness of breath, or difficulty breathing
• Sedation
• Nausea
• Disorientation
• Dry mouth
• Itchiness
• Sweating
• Constipation
• Skin rash
• Drowsiness
• Lightheadedness
• Vomiting
• Headache
• Itching
• Sweating
• Seizures