From the manufacturer's website:
When a stressful day gets in the way of a restful night, you need something that can help you fall asleep and wake up refreshed. Unisom SleepTabs are over-the-counter sleep-aids that help you fall asleep 33% faster and awaken significantly fewer times during the night.* SleepTabs with doxylamine succinate are non-habit forming and safe if used as directed. With SleepTabs, you can sleep through the night and wake up feeling recharged without grogginess or lingering side effects.
Warning: Do not use: in children under 12 years of age. Ask a doctor before use if you have a breathing problem such as asthma, emphysema or chronic bronchitis; glaucoma; trouble urinating due to an enlarged prostate gland. Ask a doctor or pharmacist before use if you are taking any other drugs. When using this product: avoid alcoholic beverages; take only at bedtime. Stop use and ask a doctor if: sleeplessness persists continuously for more than two weeks. Insomnia may be a symptom of serious underlying medical illness. Pregnancy/breast-feeding warning: If pregnant or breast-feeding, ask a health professional before use. Keep out of reach of children. In case of overdose, get medical help or contact a Poison Control Center right away. (1-800-222-1222) Other warnings: Do not use if blister unit is broken or torn. If difficult to open, use scissors.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.