Benadryl lotion, which typically contains the active ingredient diphenhydramine, is designed for topical use to relieve itching and pain from conditions like insect bites, rashes, and minor skin irritations. When applied to the skin, Benadryl lotion is not absorbed into the bloodstream in significant amounts, so it generally does not cause systemic side effects like drowsiness.
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Drowsiness is a well-known side effect of oral diphenhydramine, which is why Benadryl tablets or liquid are often used as a sleep aid. However, since the lotion is applied externally and is intended to act locally on the skin, the risk of experiencing drowsiness is minimal.
It's important to use Benadryl lotion as directed and avoid applying it to large areas of the body or on broken skin, as this could potentially increase the risk of systemic absorption and side effects. If you do notice any unusual side effects, including drowsiness, after using the lotion, it's best to stop using it and consult a healthcare provider.
In summary, while oral Benadryl can cause drowsiness, Benadryl lotion applied topically is unlikely to have this effect due to minimal systemic absorption.