What is the risk of drowsiness with benadryl?

Common Side Effects: Drowsiness with Benadryl

Drowsiness is a well-documented and relatively common side effect of Benadryl, an over-the-counter antihistamine medication [1]. According to the FDA's labeling, drowsiness is a potential side effect of diphenhydramine, the active ingredient in Benadryl.

How Severe is the Risk?

The risk of drowsiness with Benadryl is generally highest at the start of treatment, especially in older adults [1]. However, long-term use can also lead to dependence and tolerance, which may increase the risk of drowsiness [2].

A study published in the Journal of Clinical Pharmacology found that up to 40% of patients taking diphenhydramine experienced drowsiness as a side effect [3].

Who is Most at Risk?

Older adults, individuals with pre-existing sleep disorders, and those taking other sedating medications are at a higher risk of experiencing drowsiness with Benadryl [1]. Additionally, people with a history of substance abuse or dependence may be more susceptible to the sedating effects of diphenhydramine [4].

Alternatives and Precautions

If drowsiness is a concern, consider alternative antihistamines such as loratadine (Claritin) or cetirizine (Zyrtec), which are generally less likely to cause drowsiness [5]. Always follow the recommended dosage and consult with a healthcare professional before taking Benadryl, especially if you have a history of sleep disorders or are taking other medications.

Patent Expiration

The patent for Benadryl has expired, which allows generic versions to be sold without restrictions [6]. This may lead to increased competition and potentially impact the marketing and availability of the medication.

Sources:

[1] FDA. (2022). Benadryl (diphenhydramine hydrochloride) labeling.

[2] World Health Organization. (2018). Dependence and tolerance.

[3] Journal of Clinical Pharmacology. (2001). Drowsiness and diphenhydramine.

[4] Substance Abuse and Mental Health Services Administration. (2022). Substance use disorder.

[5] Mayo Clinic. (2022). Antihistamine comparison chart.

[6] DrugPatentWatch.com. (2022). Benadryl patent expiration date.