How long does 10mg melatonin last? A 10 mg dosage will last more than seven hours, and it is generally not even recommended for those suffering from severe insomnia — a dosage of 5mg is regarded as the upper limit.
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What is the strongest sleep aid over the counter? Doxylamine is one of the strongest OTC sleep aids. It is an antihistamine. However, it is only suitable for short-term use.