Tylenol (Acetaminophen) is an over-the-counter medication used to relieve mild to moderate pain from headaches, menstrual periods, muscle aches, toothaches, backaches, colds, and sore throats. The drug also reduces fever and relieves pain from vaccinations and osteoarthritis. The active ingredient in Tylenol is Acetaminophen. Acetaminophen belongs to a class of medicines called analgesics and antipyretics. Analgesics are pain relievers that inhibit pain sensation or alter pain perception. Antipyretics are fever reducers, and they work by causing the hypothalamus to override prostaglandin-induced temperature. This results in the body lowering its temperature and reducing fever.

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Get medical help immediately if you have any of these signs or an allergic reaction while taking Tylenol. The most common side effects of Tylenol may include the following:
• Constipation;
• Headache;
• Trouble sleeping;
• Upset stomach;
• Vomiting

Contact your doctor right away if you have any of the serious side effects, including:
• Breathing difficulties;
• Hives;
• Inability or difficulty passing urine;
• Itching;
• Stomach pain;
• Swallowing difficulties

These are not all of the side effects of Acetaminophen. Always contact your doctor if you notice any unusual symptoms.

You should not take Tylenol if you are allergic to Acetaminophen or any ingredient in Tylenol. Before you start taking this medication, tell your doctor about your medical history, especially if you:
• Are breastfeeding or plan to breastfeed;
• Are pregnant or plan to become pregnant;
• Drink alcoholic beverages;
• Have liver disease;
• Have phenylketonuria

Tell your doctor immediately if you become pregnant or think you may be pregnant. It is unlikely that Tylenol will harm the fetus. Inform your doctor if you are breastfeeding while using Tylenol. This drug passes into the breastmilk in trace amounts that are not harmful to your baby. Follow all instructions on the prescription label. Use Tylenol precisely as prescribed by your doctor. You can take Acetaminophen with or without food. If you miss a dose, take it as soon as you remember, except it is almost time for your next dose. Contact your doctor if your symptoms become worse. Do not share your drugs with others, even if they have your symptoms. Tell your doctor about all your medications, including prescription, OTC, herbal supplements, and vitamins. There may be drug interactions between Tylenol and other medicines, including warfarin, isoniazid, phenytoin, and tegretol. Store Acetaminophen in its original container at room temperature.

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