The ingredient in Benadryl that causes drowsiness is diphenhydramine. Commonly used as an antihistamine to treat allergies, diphenhydramine is also used as a sleep aid. Diphenhydramine is also classified as a CNS depressant, sedative and antiemetic.Know More
Following oral administration, dependent on dosage, drowsiness and other common side effects normally last between 4 to 6 hours. The side effects of diphenhydramine, such as drowsiness, are worsened by the use of alcohol, sedatives and tranquilizers, as well as MAOIs, other CNS depressants and hypnotics. These effects are more pronounced in the elderly.
Some other notable side effects of diphenhydramine include agitation, confusion, fatigue, irritability, paresthesia, blurred vision and depression. In overdose, symptoms may include excitement, ataxia, tremor, sinus tachycardia, fever, hallucination, athetosis, convulsions, seizures, hypotension, deep coma, cardiorespiratory collapse and death.Learn more about Side Effects
A side effect of Benadryl is that it causes drowsiness, which can make people fall asleep. Numerous over-the-counter sleep aids contain antihistamines such as diphenhydramine and doxylamine succinate because of their potent sedative effects.Full Answer >
A single dose of Diphenhydramine hydrochloride, commonly known as Benadryl, is active in the body for between four and six hours on average. The drug is almost completely excreted from the body within 24 hours, as explained by Drugs.comFull Answer >
There are many mild to severe side effects of Zyrtec that can include drowsiness, dry nose, dry mouth, difficulty sleeping, throat pain, irregular heart beat, bronchospasm, a heart pounding sensation, liver problems, seizures, diarrhea, blurred vision, severe water retention and painful urination, notes WebMD. Some patients may also develop hepatitis or incur an allergic reaction that is life threatening.Full Answer >
There are no reported withdrawal symptoms for Benadryl if taken as directed. Benadryl is a brand name for the antihistamine diphenhydramine, which is not considered to be an addictive substance.Full Answer >