Acetaminophen and codeine tablets, also known as Tylenol with Codeine number 3, are a prescription medication used to treat moderate to severe pain, according to Drugs.com. Codeine is an opioid pain reliever, and acetaminophen is a mild pain reliever that enhances the effects of codeine.
Before taking acetaminophen and codeine tablets, patients should tell their doctor if they have a history of liver problems, bowel problems, kidney disease, breathing disorders or head injury, states Drugs.com. Common side effects of this medication include drowsiness, constipation, upset stomach, dry mouth and blurred vision. Serious side effects necessitate immediate medical attention and include confusion, shallow breathing, seizures, and easy bleeding or bruising.