Each Tylenol with Codeine #4 tablet contains 300 milligrams of acetaminophen and 60 milligrams of codeine, according to RxList. Each tablet also contains fillers, including powdered cellulose, magnesium stearate, sodium metabisulfite, pregelatinized starch and corn starch.
Tylenol with Codeine #4 is an opioid, or narcotic, pain medication doctors prescribe to treat moderate to severe pain, explains Drugs.com. Patients should not take this medication if they have recently consumed alcohol or taken sedatives, tranquilizers or other narcotic medications. People with a history of liver disease, kidney disease, head injury, brain tumor or stroke may require close monitoring while taking Tylenol with Codeine #4. Pregnant women should not take Tylenol with Codeine #4, as it may cause drug dependency in the unborn baby. Babies who are born with drug dependency typically experience withdrawal symptoms after birth and require extensive medical care.
Common side effects of Tylenol with Codeine #4 include drowsiness, upset stomach, constipation, blurred vision and dry mouth, notes Drugs.com. Rarer, more severe side effects of Tylenol with Codeine #4 include shallow breathing, slow heart rate, fainting, unusual bruising or bleeding, and yellowing of the skin or eyes. To avoid potentially serious complications, patients experiencing severe side effects should consult with their doctor as soon a possible.