QuviviqMelatonin PR (Circadin)PromethazineZ-drugs (zopiclone)CBT-I
Active ingredientDaridorexant 25 mg / 50 mgMelatonin 2 mg prolonged-releasePromethazine hydrochloride 25 mgZopiclone 3.75 mg / 7.5 mg, zolpidemNot a medicine
How it's takenOne tablet within 30 minutes of bed, only with a 7-hour sleep windowOne tablet 1 to 2 hours before bedOne to two tablets at nightOne tablet at bedtimeStructured 6 to 8 week programme, digital or in person
MechanismBlocks orexin, the wake signalSupplements the sleep hormone melatoninSedating antihistamineGABA sedationRetrains sleep drive and sleep-related thoughts and habits
EvidenceTwo phase 3 trials, 1,850+ adults; 50 mg improved sleep onset, night waking and daytime functioning; effect maintained to 12 monthsModest improvements in sleep quality and morning alertness in over-55sLimited trial evidence; rapid toleranceEffective short-term; effect fades and risks rise with continued useStrongest and most durable evidence of any insomnia treatment
UK licence / statusMHRA-licensed for long-term insomnia; NICE TA922MHRA-licensed, 55+, up to 13 weeksPharmacy (P) medicine, 16+, short-termLicensed up to 4 weeks; Schedule 4 controlled drugsNICE first-line
DependenceNo evidence in trials; not a controlled drugNot associated with dependenceTolerance within daysRecognised risk of dependence and withdrawalNone
Best suited toAdults with insomnia of 3+ months affecting daytime function, where CBT-I has not worked or is unavailableAdults 55+ with poor sleep qualityThe occasional bad nightGP-managed short courses onlyEveryone with chronic insomnia, alongside or instead of medication
Available from From MarsYes, following a free online assessmentNo. Ask your GPNo. Pharmacy counterNo. We do not supply controlled drugsNot a medicine. NHS, apps or private providers; we signpost you