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. Its active compounds — valerenic acid and valerenol — increase levels of GABA (gamma-aminobutyric acid), the brain's primary inhibitory neurotransmitter. That's the same system prescription anxiolytics like benzodiazepines act on, just far more mildly.

This mechanism is why valerian appears in so many UK calming products: Dorwest's tablets and drops, Pet Remedy's diffusers and sprays, and a long list of calming treats. It's also why valerian is one of the few herbal options that produces a noticeable same-day effect rather than needing weeks of build-up.

The distinctive (frankly unpleasant) smell of valerian root is normal — it comes from the same volatile oils that do the calming work. 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:

• A 2022 Cambridge University trial of Dorwest Scullcap & Valerian Tablets found 87% of owners reported reduced fireworks anxiety — encouraging, but the data is unpublished, owner-reported, and small (n=46)
• Olfactory studies of valerian-scented environments in kennelled dogs suggest modest calming effects from the scent alone
• A plausible mechanism — the GABA pathway is well-characterised, and the pairing with skullcap (which enhances GABA-receptor sensitivity) is pharmacologically sensible

Our honest read: valerian sits in the "worth trying, don't expect miracles" tier — behind L-theanine and alpha-casozepine on evidence, but ahead of most herbs on speed of onset. 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	Valerian 250mg, mistletoe 150mg, gentian 48mg, scullcap 30mg per tablet	Liquid extracts of valerian, mistletoe and vervain
Onset	Use daily for 3+ weeks for full effect	Around 30 minutes
Status	UK-licensed herbal veterinary medicine (AVM-GSL)	Herbal supplement, same brand heritage (Dorwest, since 1948)
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: dosed by size band on the label, given about 30 minutes before the trigger, and repeatable per label instructions. Mix into food or give directly by mouth.
• Valerian-containing treats and chews: follow the pack — but check the actual valerian content. Many treats contain well under 100mg per chew, a fraction of the tablet dose. This is the most common reason "valerian didn't work".

Side Effects and Safety

Valerian is generally well tolerated by dogs at label doses. The side effects that do occur are usually mild:

• Drowsiness or lethargy — the most common effect, and sometimes the point
• Stomach upset — occasional soft stools or reduced appetite, usually settling within a few days
• Paradoxical excitement — a small minority of dogs get more wound up rather than calmer
• Morning grogginess — at higher evening doses

Scullcap and Valerian Side Effects

The combination product adds scullcap, mistletoe and gentian to valerian. Owner-reported side effects remain the same short list — drowsiness and occasional digestive upset — and the tablets' AVM-GSL status means the formulation is manufactured to veterinary medicine standards. The practical cautions are about interactions, not the herbs alone:

• Sedatives and anaesthetics: valerian enhances sedation. Stop valerian products before any planned anaesthesia and tell your vet your dog takes them
• Prescription anxiety medication: don't stack valerian on top of SSRIs, trazodone or benzodiazepines without veterinary sign-off
• Blood pressure medication: valerian may enhance its effects
• Pregnant or nursing dogs and very young puppies: avoid — safety data doesn't exist. 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, unregulated for animal use, and sometimes combined with other ingredients (hops, melatonin blends, 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 meaningfully better canine evidence and calms without sedating; valerian is more sedating, which suits nighttime or event use. Similar onset speed.
• Valerian vs melatonin: melatonin is the stronger natural sedative but isn't sold OTC for dogs in the UK; valerian products are.
• Valerian vs the whole OTC sedative field: our natural sedatives guide ranks all nine 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.

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 honest-to-goodness thin — but the risk at label doses is low, the mechanism is real, 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.