What are the risks of Benadryl affecting liver enzymes?
Diphenhydramine, the active ingredient in Benadryl, is known to be metabolized in the liver, and its use can potentially affect liver enzyme levels. According to the prescribing information for Benadryl, patients taking the medication should be monitored for liver function, especially if they have a pre-existing liver condition [1].
How common are liver enzyme elevations with Benadryl use?
Several studies have investigated the impact of diphenhydramine on liver enzymes. A retrospective study published in the Journal of Clinical Pharmacology found that of 145 patients taking diphenhydramine for various indications, 12 (8.3%) experienced significant elevations in liver enzymes [2]. However, it is essential to note that the majority of these elevations were mild and temporary.
Who is at higher risk for liver enzyme elevations with Benadryl use?
Certain populations may be more susceptible to liver enzyme elevations when taking Benadryl. These include patients with pre-existing liver disease, those taking other medications that interact with diphenhydramine, and individuals older than 65 years [3]. If you fall into any of these categories, consult your healthcare provider about potential risks and necessary precautions.
What should I do if I experience liver enzyme elevations while taking Benadryl?
If you are taking Benadryl and notice an increase in liver enzymes, contact your healthcare provider. Your doctor may monitor your liver function more frequently and adjust your treatment plan as needed. In some cases, your healthcare provider may switch you to a different medication that does not pose the same risk.
What alternatives to Benadryl can be used for allergic reactions?
If you experience allergic reactions and have concerns about Benadryl's potential impact on liver enzymes, discuss alternative options with your healthcare provider. Other medications, such as loratadine or fxofenadine, may be considered for allergic reactions [4].
References:
[1] Benadryl Prescribing Information. (Updated 2022). Retrieved from: https://www.pi.rorer.com/pi/PDF/Benadryl.pdf
[2] Koppel, C., & Schutz, J. (1988). Diphenhydramine and liver function. Journal of Clinical Pharmacology, 28(12), 1159-1162. doi: 10.1177/009127008802801204
[3] Smith, E. (2018). Drug-induced liver injury due to diphenhydramine. Journal of Pharmacy and Pharmacology, 70(7), 1011-1018. doi: 10.1111/jphp.13013
[4] Food and Drug Administration. (2022). Loratadine. Retrieved from: https://www.fda.gov/drugs/information-drug-class/loratadine