Melatonin vs Doxylamine (2026): A Supplement and a Drug, Side by Side

A dietary supplement and an over-the-counter drug are regulated under different frameworks and labeled under different rules. A supplement carries a Supplement Facts panel, may make structure and function claims, and must state that the FDA has not evaluated them. An over-the-counter drug carries a Drug Facts panel in a standardized format: active ingredient, purpose, uses, warnings, directions, other information, inactive ingredients. It is permitted to state what it is for, because it went through a different process to get there.

That is why this page will not tell you which one is better. A publication that reads labels for a living cannot responsibly rank a product whose statements the FDA has not evaluated against an approved over-the-counter drug on the question of effect. What we can compare is category, disclosure, price, and who each label includes and excludes. Everything below stays inside those lines, and the Drug Facts panel on the package in your hand stays the authority for that package.

The melatonin side says relatively little. Natrol's listing title states the amount, the form and the count and no age range; the Supplement Facts panel carries the maker's guidance. The category's own general guidance, commonly cited by sleep clinicians, is the lowest amount that helps, often described as 0.5 to 3 mg. Beyond that, melatonin's cautions are about interactions, with blood thinners, immunosuppressants and blood-pressure and diabetes medication among the classes flagged, and about not driving afterward.

The Drug Facts label on a doxylamine succinate nighttime sleep-aid is far more specific, because it is required to be. As the label states: the purpose is nighttime sleep-aid, the use is for relief of occasional sleeplessness, and the directions are for adults and children 12 years and over, one tablet 30 minutes before going to bed or as directed by a doctor. The label states not to use it in children under 12. It directs asking a doctor before use with a breathing problem such as emphysema or chronic bronchitis, with glaucoma, or with trouble urinating due to an enlarged prostate gland, and asking a doctor or pharmacist before use if taking sedatives or tranquilizers.

The Drug Facts label for doxylamine nighttime sleep-aids states, when using this product, to avoid alcoholic beverages, that drowsiness will occur, and not to drive a motor vehicle or operate machinery. Those are not our cautions; they are printed on the box, and they are printed there because they are the ones that matter most in practice. If pregnant or breast-feeding, the label directs asking a health professional before use. Keep out of reach of children, and in case of overdose get medical help or contact a Poison Control Center right away at 1-800-222-1222.

Melatonin carries its own version of some of this without the same regulatory weight. Do not drive after taking it. Do not combine it casually with alcohol, which is covered in melatonin and alcohol. Talk to a pharmacist if you take prescription medication. And keep gummies out of children's reach: poison-control calls about pediatric melatonin ingestions rose sharply through the early 2020s, and gummies are the form most involved. The difference is that melatonin's cautions come from research and general guidance while doxylamine's come from an approved label, and a label instruction is not optional.

Natrol's melatonin is about 10 cents a tablet. Unisom SleepTabs is about 17 cents a tablet. But the more useful price fact on this page is inside the drug category rather than across it: Kirkland Signature Sleep Aid states doxylamine succinate 25 mg, 96 tablets, at $7.93, about 8 cents a tablet, and Amazon Basic Care Nighttime Sleep Aid states the same 25 mg, 96 tablets, at $9.44, about 10 cents. Both are the same active ingredient at half or less of the Unisom price per tablet.

Store-brand and national-brand over-the-counter drugs with the same active ingredient at the same amount are held to the same standard, which is the entire logic of the store-brand aisle. If you and a pharmacist have decided a doxylamine product is appropriate, the brand name is the part you can stop paying for. Kirkland's two-pack at $13.74 for 192 tablets is about 7 cents a tablet, the lowest figure on this page for either category.

Unisom is a drug brand that also sells supplements. SleepTabs is doxylamine with a Drug Facts panel. Simple Slumbers is a melatonin gummy stating drug free. Unisom Sleep Support Gummies state magnesium and ashwagandha and contain neither melatonin nor a drug. Three propositions, one name, one shelf.

Vicks does the same thing on a larger scale: the original ZzzQuil Nighttime Sleep Aid Liquid states 50 mg diphenhydramine HCl and is a drug, while the Pure Zzzs line is melatonin and is a supplement. Same brand family, two categories, similar packaging. We describe the diphenhydramine product only as labeled, and the whole tangle is unpicked in melatonin vs ZzzQuil. The practical defense is the same in both cases: turn the box over and find the panel before you find the price.

You want a dietary supplement: Natrol Melatonin 3 mg Fast Dissolve, $7.32 for 90, about 8 cents a night, rather than the 5 mg bottle.

You want a melatonin gummy from a pharmacy name: Unisom Simple Slumbers, $9.99 for 60. It says drug free on the front because it is a supplement.

You are considering the over-the-counter drug: that is a conversation with a pharmacist, not with us. Read the Drug Facts panel first, particularly the warnings and the two-week instruction. If you and a pharmacist decide it is appropriate, Kirkland Signature states the same active ingredient at 25 mg for about 8 cents a tablet against Unisom's 17.

You are under 18, pregnant, nursing, or on prescription medication: the doxylamine label directs asking a health professional, and it states not for children under 12. Melatonin during pregnancy is covered in melatonin during pregnancy, which reaches the same conclusion: ask a doctor.

Your sleeplessness has run more than two weeks: the Drug Facts label itself tells you to stop and see a doctor, and that is the best sentence on either box. Every buyer: turn the package over and read the panel before you compare prices.