Galpharm One A Nightcalm 50mg 20 Tablets Galpharm One A Nightcalm 50mg Tablets are an over-the-counter sleep aid designed to help relieve temporary sleeping difficulties and support a restful night’s sleep. Each tablet contains 50mg diphenhydramine hydrochloride, a sedating antihistamine that helps you fall asleep faster and improves sleep continuity when occasional insomnia is making it hard to switch off. How It Works Diphenhydramine hydrochloride works by blocking histamine receptors in the brain, producing a calming, drowsy effect that helps reduce the time it takes to fall asleep and supports deeper, less disturbed sleep. This product is intended for short-term use to manage temporary sleep disturbance such as stress, travel-related disruption or changes to routine. Key Features Each tablet contains 50mg diphenhydramine hydrochloride. One tablet per night for convenient dosing. For short-term relief of temporary sleep disturbance in adults and young people aged 16+. Suitable when difficulty sleeping is affecting rest, focus or next-day function. This information is a guide only and does not replace the full patient information leaflet supplied with the product or advice from a healthcare professional.