Tylenol PM is comprised of acetaminophen and diphenhydramine. These ingredients are used as a pain reliever and sleep aid. Tylenol PM relieves pain that can cause sleeplessness. Individuals only seeking assistance in getting to sleep should opt for a different product as the acetaminophen in this product would be unnecessary. As with any drug or medication, Tylenol PM has the potential for side effects. This medication is intended for short-term use only.
Drowsiness
Because Tylenol PM is a sleep aid, you should experience drowsiness. This may impact some individuals more than others. Until you know how this product will affect you, it is important that you avoid operating heavy machinery or driving. If this medication is taken properly, grogginess should not occur, you may react differently. Taking more than recommended dose, taking Tylenol PM with other medications or allowing too few hours for rest can increase the chances of grogginess the next day. Alcohol can also increase the drowsiness you may feel after taking this product and is not recommended.
Physical Effects
Tylenol PM is not considered to be habit-forming, but it should only be taken in the manner described on the label and only for as long as suggested. The ingredients in this sleep aid make most individuals sleepy, but in some cases the opposite may occur. Rarely, you may experience nervousness or restlessness that will pass within four to six hours of taking the product. Dizziness, trouble concentrating, memory loss or blurred vision are less common side effects that are not considered serious if they cease after the medication leaves your body.
More Severe Effects
Acetaminophen may cause liver damage. Consuming alcohol with this product is strongly discouraged because it can increase the chances of liver damage. An allergic reaction to Tylenol PM can be indicated by swelling in the throat, lips, tongue and face. You may also find it difficult to breathe or develop hives if you are allergic to this product. According to Drugs.com, other serious side effects include changes in heartbeat or irregularities, confusion, unusual weakness, bruising easily, flu symptoms, dark urine, clay-colored stools or yellowing of the skin or eyes. If you experience any of these more severe side effects, contact your health care provider immediately.



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