Valerian for Dogs UK 2026: Dosage, Safety & How Fast It Works

What Is Valerian and How Does It Calm Dogs?

Valerian (Valeriana officinalis) is a flowering herb whose root has been used as a sedative for centuries in both humans and animals. How it works in dogs isn't known: the UK product licence says so. In lab studies, valerenic acid acts on GABA-A receptors, the same calming receptors that prescription benzodiazepines target.

Valerian appears in many UK calming products: Dorwest's tablets and drops, Pet Remedy's diffusers and sprays, and a long list of calming treats. Dorwest's drops are also one of the few herbal options sold for same-day use rather than weeks of build-up.

The distinctive (frankly unpleasant) smell of valerian root is normal — it comes from the root's volatile oils. Most dogs tolerate it in food; a few refuse it outright.

Does Valerian Work for Dogs? The Honest Evidence

Here's the part most product pages skip: there are no published clinical trials testing standalone valerian in dogs. The recommendations you'll see — including from integrative vets — are extrapolated from human and rodent studies, and even in humans, systematic reviews rate the evidence as inconclusive.

What does exist for dogs:

• One placebo-controlled trial of a combination supplement: in Brazil, 44 dogs were given a supplement combining valerian with tryptophan and passionflower, or a placebo, twice daily for about six weeks over New Year. Fear of fireworks fell by 41% in the supplement group against 27% on placebo. The maker funded it, and valerian's own share of the effect can't be separated out (Ramos et al. 2024)
• An unpublished student project: Dorwest cites a 2022 University of Cambridge veterinary student project in which 87% of 46 owners saw less fireworks anxiety on Scullcap & Valerian Tablets. The data has not been published
• Lab evidence on mechanism: valerenic acid acts on GABA-A receptors in lab studies, but this hasn't been shown in dogs

Our honest read: valerian sits in the "worth trying, don't expect miracles" tier. In a survey of 1,225 owners of firework-fearful dogs, herbal products were rated effective 35% of the time, against 70% for prescription medication (Riemer 2020). For a full evidence ranking of all seven major calming herbs, see our herbal calming remedies guide.

Scullcap & Valerian Tablets vs Valerian Compound Drops

Most UK "valerian for dogs" searches end up at one of two Dorwest products, and they do different jobs:

	Scullcap & Valerian Tablets	Valerian Compound (liquid drops)
Job	Daily, long-term anxiety management	Fast top-up before a predictable event
Contains	Per tablet: valerian extract 50mg (from about 250mg root), mistletoe extract 50mg, gentian extract 24mg, scullcap herb 30mg	Fresh herb extracts: vervain 50%, valerian 25%, mistletoe 25%
Onset	Use daily for 3+ weeks for full effect	About 30 minutes; lasts up to 2 hours
Status	Licensed as a herbal veterinary medicine (AVM-GSL, Vm 00866/4021; licence text revised 2019), but we couldn't find it on the VMD's list of currently authorised products in September 2026	Sold by Dorwest (since 1948) as a herbal medicine; we could not confirm a UK authorisation
Best for	Generalised or ongoing anxiety	Fireworks, vet visits, travel, one-off stressors — or trying valerian cheaply before committing

Dorwest positions the two as companions: tablets for the daily baseline, drops for breakthrough moments (Bonfire Night, a thunderstorm, the groomer). If you're starting from scratch, the drops are the low-cost way to find out whether valerian visibly helps your dog at all.

Valerian Dosage for Dogs

Always dose by the product label, not by generic "valerian root" advice from human supplements — concentrations vary enormously between preparations.

• Scullcap & Valerian Tablets: Dorwest's label doses 1-2 tablets per 5kg of bodyweight daily, split between morning and evening. A 20kg dog typically starts at 4 tablets a day (roughly £15 a month). Allow at least 3 weeks of daily use before judging the effect.
• Valerian Compound drops: Dorwest's label gives ¼ teaspoon for small dogs, ½ for medium, 1 for large and 1½ for giant breeds, about 30 minutes before the trigger, with no more than 2 doses in 24 hours. For moderate fears, Dorwest advises starting about 10 days before the worst night. Mix into food or give directly by mouth.
• Valerian-containing treats and chews: follow the pack, and check it states how much valerian each chew contains; many don't. No veterinary reference we could find gives a mg-per-kg dose for valerian root.

Side Effects and Safety

The Scullcap & Valerian licence reports side effects only very rarely (fewer than 1 in 10,000 animals): restlessness or anxiety, diarrhoea, tiredness or seeming unwell. Dorwest describes both products as non-drowsy. Stop and ask your vet if you see side effects.

Both Dorwest products contain mistletoe extract. The mistletoe plant itself is poisonous to dogs, so keep to the label dose and store bottles out of reach.

Scullcap and Valerian Side Effects

The tablets add scullcap, mistletoe and gentian to valerian. The licence lists the rare side effects above and no known interactions. Sensible cautions all the same:

• Anaesthetics and sedatives: tell your vet your dog takes valerian before any anaesthetic, and before combining it with sedatives
• Prescription anxiety medication: don't stack valerian on top of SSRIs, trazodone or benzodiazepines without veterinary sign-off
• Pregnant or nursing dogs: the licence says use is not recommended. Dorwest says the tablets are suitable from 8 weeks of age. See the puppy anxiety guide for what is age-appropriate

Can You Give Dogs Human Valerian Tablets?

Don't. Human valerian supplements are dosed for a 70kg adult and sometimes combined with other ingredients (hops, sweeteners, including xylitol, which is toxic to dogs). Dog-specific products cost about the same and remove all of that risk. If you're tempted by the human aisle to save money, the 30ml Valerian Compound bottle is the cheaper experiment anyway.

Valerian vs the Other Calming Options

• Valerian vs L-theanine: L-theanine has three small dog studies of one product, given twice daily for weeks; it calms without sedating. Valerian Compound is the faster event option.
• Valerian vs melatonin: melatonin is more sedating but prescription-only in the UK, so your vet decides; valerian products are sold over the counter.
• Valerian vs the whole OTC sedative field: our natural sedatives guide compares six options by evidence and strength.
• Valerian in a diffuser: Pet Remedy uses low-dose valerian with vetiver, basil and clary sage as a plug-in — a different, scent-based delivery for dogs that refuse oral products. Its one placebo-controlled dog trial found no significant effect (Taylor & Madden 2016).

For how valerian tablets stack up against Zylkene, YuMOVE, Nutracalm and Anxitane in a straight product comparison, see our best calming tablets for dogs UK review.

The Bottom Line

Valerian is the UK's most accessible fast-acting herbal calmer: cheap to trial, quick to show whether it helps, and available in a properly licensed veterinary formulation. The evidence base is thin, but side effects at label doses are very rare, and for event-led anxiety (fireworks, travel, vet visits) the 30-minute onset fills a gap that slower-building supplements can't. Try the drops first; if valerian visibly suits your dog, the daily tablets are the long-term version of the same bet.