The Herbal Sedative With GABA-Enhancing Properties
Valerian (Valeriana officinalis) is one of the oldest and most widely used herbal sedatives, with documented use extending back to ancient Greece. In veterinary practice, valerian is used primarily for situational anxiety in dogs — noise phobia (thunderstorms, fireworks), travel stress, and mild separation anxiety. Its pharmacological mechanism is better characterized than most herbal anxiolytics, centering on enhancement of GABA (gamma-aminobutyric acid) signaling in the central nervous system.
Valerian root contains a complex mixture of active compounds: valerenic acid (the primary anxiolytic compound), isovaleric acid (responsible for the distinctive unpleasant odor), iridoids (valepotriates), and various flavonoids. The synergy between these compounds appears to be important — isolated valerenic acid is less effective than whole-root extracts in most studies, suggesting multiple active pathways contribute to the overall effect.
How Valerian Works
GABA-A receptor modulation: A 2009 Neuropharmacology study demonstrated that valerenic acid is a positive allosteric modulator of GABA-A receptors, specifically binding to the beta-3 subunit. This is the same general receptor family targeted by benzodiazepines, barbiturates, and anesthetic agents, though valerenic acid binds to a different site and produces milder effects. The result is enhanced GABA-mediated inhibitory neurotransmission, which reduces neuronal excitability and produces calming, anxiolytic, and mildly sedative effects.
GABA reuptake inhibition: Valerian compounds also inhibit GABA reuptake by synaptic terminals and may inhibit GABA transaminase (the enzyme that degrades GABA). Both mechanisms increase GABA availability in the synaptic cleft, reinforcing the inhibitory tone.
Adenosine receptor interaction: Some evidence suggests valerian interacts with adenosine receptors, which participate in sleep-wake regulation. This may contribute to the sleep-promoting effects separate from the GABA mechanism.
Practical Veterinary Applications
Noise phobia: Thunderstorm and fireworks anxiety is one of the most common behavioral complaints in dogs. A 2015 review in the Journal of Veterinary Behavior noted that herbal anxiolytics, including valerian, are frequently used for noise phobia management. Valerian is most effective when given 30-60 minutes before the anticipated noise event. For unpredictable events (thunderstorms), this requires monitoring weather forecasts.
Travel anxiety: Dogs that become anxious during car travel may benefit from pre-travel valerian administration. The mild sedative effect can reduce panting, drooling, and restlessness without the pronounced sedation of prescription options.
Situational stress: Veterinary visits, grooming appointments, and similar predictable stressors are reasonable use cases for valerian. The key word is “situational” — valerian is not appropriate for chronic daily anxiety management, which requires behavioral intervention and potentially prescription medication.
Evidence Quality
A 2006 systematic review in the American Journal of Medicine assessed valerian for anxiety and sleep in humans. Results were mixed — some studies showed significant benefit, others showed no difference from placebo. The inconsistency likely reflects variability in valerian preparations, dosing, and study populations.
For dogs specifically:
- No randomized controlled canine trials have been published for valerian as a sole anxiolytic agent.
- Valerian appears in several commercially available veterinary calming supplements, usually in combination with other ingredients (L-theanine, chamomile, passionflower), making isolated efficacy assessment impossible.
- Veterinary practitioners report clinical utility for mild situational anxiety, consistent with the known pharmacology.
- The GABA-A receptor mechanism is well-established and species-conserved, supporting biological plausibility for canine use.
Dosing by Dog Size
Valerian dosing depends on the preparation:
| Dog Size | Weight Range | Dried Root | Tincture (1:5) | Standardized Extract | Notes |
|---|---|---|---|---|---|
| Toy | Under 5 kg (under 11 lbs) | 250-500 mg | 0.5-1 mL | 50-100 mg | Give 30-60 min before stressor |
| Small | 5-10 kg (11-22 lbs) | 500 mg-1 g | 1-2 mL | 100-200 mg | |
| Medium | 10-25 kg (22-55 lbs) | 1-2 g | 2-3 mL | 200-400 mg | |
| Large | 25-40 kg (55-88 lbs) | 2-3 g | 3-5 mL | 400-600 mg | |
| Giant | Over 40 kg (over 88 lbs) | 3-5 g | 5-7 mL | 600-800 mg |
Timing is critical: Valerian takes 30-60 minutes to reach peak effect. Giving it after the dog is already panicking from a thunderstorm is too late. Plan administration based on anticipated stressor timing.
Tincture note: Alcohol-based tinctures should be diluted in water or food before giving to dogs. Glycerin-based tinctures are preferred for palatability and safety.
Safety and Interactions
- Sedative potentiation — this is the most important interaction. Valerian enhances GABA-A activity, and combining it with other GABAergic drugs (benzodiazepines, gabapentin, phenobarbital, trazodone) can cause excessive sedation, ataxia, and respiratory depression. Dogs on any sedative or anxiolytic medication should not receive valerian without veterinary approval.
- Seizure medications — dogs on phenobarbital, potassium bromide, or levetiracetam should not receive valerian. The overlapping GABAergic mechanisms create unpredictable drug interactions.
- Liver metabolism — valerian may inhibit certain cytochrome P450 enzymes. Dogs on chronic medications metabolized by the liver should use valerian cautiously.
- Paradoxical excitation — some dogs (and some humans) experience paradoxical stimulation from valerian, becoming more agitated rather than calmer. If this occurs, discontinue immediately.
- Pregnancy and nursing — insufficient safety data. Avoid in pregnant and nursing dogs.
- Surgery — discontinue valerian at least 2 weeks before scheduled surgery due to potential interactions with anesthetic agents.
- The smell — valerian root has a strong, unpleasant odor (due to isovaleric acid). Many dogs will refuse it in unflavored form. Hiding it in strong-smelling food (sardines, liver paste) may help.
Frequently Asked Questions
Is valerian strong enough to help my dog during fireworks? For mild to moderate noise anxiety, valerian may take the edge off. For dogs with severe noise phobia — those that become destructive, injure themselves, or have panic-level responses — valerian alone is insufficient. These dogs need veterinary behavioral assessment and potentially prescription anxiolytics (sileo/dexmedetomidine gel, trazodone, alprazolam). Valerian is a supplement for mild cases, not a treatment for severe phobia.
Can I give valerian to my dog every day? Valerian is best used situationally, not daily. Chronic daily use may lead to tolerance (reduced effectiveness over time) and the GABA-modulating effects are not well-characterized for long-term canine use. For dogs needing daily anxiety management, behavioral modification and veterinary-prescribed medications are more appropriate than daily herbal sedatives.
Can I combine valerian with L-theanine or melatonin? Both combinations are commonly found in commercial veterinary calming products. L-theanine acts primarily through serotonin and dopamine modulation (plus mild GABA effects), so the combination with valerian’s stronger GABA mechanism may provide complementary calming. Melatonin promotes sleep through melatonin receptor activation, a different pathway from valerian’s GABA enhancement. Both combinations are generally considered safe at standard supplement doses, but dogs on prescription anxiolytics or sedatives should not add these without veterinary guidance.
Why does valerian smell so terrible? Isovaleric acid, a component of valerian root, is chemically similar to the compounds responsible for the smell of dirty socks and aged cheese. Ironically, many cats are strongly attracted to valerian (it contains actinidine, which has a similar effect to nepetalactone in catnip). Dogs are generally indifferent to or repelled by the smell.
Related Science
- Anxiety Disorders and Canine Longevity: How Chronic Stress Shortens Lifespan
- Choosing Veterinary Specialists: When to Refer and Which Specialists Matter Most
- Circadian Rhythm and Dog Longevity
- Noise Phobia in Dogs: Physiological Impact and Longevity Implications
- Separation Anxiety and Health in Dogs: The Physiological Cost of Being Left Alone
References
- Valerian for anxiety and sleep disorders: a systematic review (American Journal of Medicine, 2006)
- Valerenic acid and GABA-A receptor modulation (Neuropharmacology, 2009)
- Herbal anxiolytics in veterinary practice (Research in Veterinary Science, 2015)
- Canine noise phobia: a review of management approaches (Journal of Veterinary Behavior, 2015)