diphenhydramine vs zaleplon
Side-by-side comparison of diphenhydramine and zaleplon. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
Diphenhydramine: Diphenhydramine is reported to be a weak inhibitor of aldehyde oxidase in rat liver, but its inhibitory effects in human liver are not known. There is no pharmacokinetic interaction between zaleplon and diphenhydramine following the administration of a single dose (10 mg and 50 mg, respectively) of each drug.
Recommendation: No dose adjustments are usually needed when taking these two drugs together. Always inform your doctor about all medications you are using.
Benadryl
Sonata
Diphenhydramine, also known as Benadryl, is an antihistamine medicine. It helps relieve allergy and cold symptoms.
Zaleplon (Sonata) is a medicine that helps you fall asleep faster. It is used for short-term treatment of insomnia.
This medicine temporarily relieves symptoms from allergies or hay fever. These symptoms include sneezing, itchy nose or throat, runny nose, and itchy, watery eyes. It also helps with sneezing and runny nose caused by the common cold.
Zaleplon is used to treat insomnia, which means you have trouble falling asleep. It can help you fall asleep faster for up to 30 days. However, it does not increase the total time you sleep or decrease the number of times you wake up during the night.
Diphenhydramine blocks histamine, a natural substance that your body makes during an allergic reaction. By blocking histamine, it reduces allergy symptoms. It can also dry up nasal passages to relieve a runny nose.
Zaleplon is a non-benzodiazepine hypnotic. It works by slowing activity in the brain to allow sleep. It affects certain brain chemicals to help you fall asleep.
- • Headache
- • Fatigue
- • Nausea
- • Headache
- • Dizziness
- • Somnolence (sleepiness)
- Headache 5,138
- Tiredness 5,076
- Feeling sick to your stomach 4,484
- Pain 4,014
- Sinus infection 3,668
- Feeling sick to your stomach 111
- Killed themselves 88
- Trouble sleeping 80
- Pain in your head 79
- Accidentally falling down 77
No specific warnings noted.
Zaleplon can cause complex sleep behaviors like sleepwalking, sleep-driving, and doing other activities while not fully awake. Some of these activities can result in serious injuries or even death. Stop taking zaleplon immediately and call your doctor if you experience any of these behaviors. Zaleplon can be habit-forming. Keep it in a safe place to prevent misuse.
If you are pregnant or breastfeeding, talk to your doctor before using this medicine. It is important to weigh the benefits and risks with your doctor.
It is not known if zaleplon can harm your unborn baby. Talk to your doctor if you are pregnant, plan to become pregnant, or are breastfeeding.
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How to Read This diphenhydramine vs zaleplon Comparison
diphenhydramine is classified in the First-Generation Antihistamine drug class, while zaleplon sits within the Non-Benzodiazepine Hypnotic (Z-Drug) class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are split between OTC and prescription status, which affects access and supervision.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, diphenhydramine has 22,380 submissions while zaleplon has 435. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to diphenhydramine might weakly block a liver enzyme, but studies show it does not change how the body processes zaleplon. there is no evidence that these drugs interfere with each other's levels in the blood.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between diphenhydramine and zaleplon - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.