Treatment of idiopathic headshaking in horses with pulsed high-dose dexamethasone.
Authors: Tomlinson J E, Neff P, Boston R C, Aceto H, Nolen-Walston R D
Journal: Journal of veterinary internal medicine
Summary
# Treatment of Idiopathic Headshaking in Horses with Pulsed High-Dose Dexamethasone Idiopathic headshaking remains poorly understood in equine medicine, with limited treatment options and uncertain underlying mechanisms; however, given the potentially inflammatory nature of the condition, Tomlinson and colleagues investigated whether anti-inflammatory dosing with dexamethasone might reduce clinical signs. Over four months, 20 horses diagnosed with idiopathic headshaking received either pulsed oral dexamethasone (60 mg daily for four consecutive days, repeated every three weeks) or placebo in a blinded, prospective trial, with owners scoring headshaking severity on a 0–4 scale three times weekly. Twelve horses completed the study, but no significant difference emerged between treatment and placebo groups (P = 0.987), though environmental triggers—particularly sun exposure (P ≤ 0.001), wind (P = 0.028), and exercise (P ≤ 0.045)—consistently exacerbated signs in both groups. These findings suggest that systemic corticosteroid therapy alone is unlikely to resolve idiopathic headshaking, despite its anti-inflammatory properties, and reinforce the importance of environmental management and the strong association with light sensitivity in clinical cases. Practitioners should focus on identifying and minimising trigger exposure whilst considering alternative treatment approaches or referral for further diagnostic investigation, as oral dexamethasone does not represent an effective therapeutic option for this frustrating condition.
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Practical Takeaways
- •Anti-inflammatory corticosteroid therapy is not an effective treatment for idiopathic headshaking in horses despite theoretical inflammatory etiology
- •Environmental and exercise management (minimizing sun, wind exposure) remains the primary practical approach to reducing headshaking symptoms
- •Consider alternative diagnostic and treatment strategies rather than pursuing corticosteroid protocols for this condition
Key Findings
- •Pulsed high-dose dexamethasone (60 mg PO Q24h × 4 days, q3 weeks for 4 months) showed no significant benefit over placebo in reducing idiopathic headshaking signs (P = 0.987)
- •Sun exposure, wind, and exercise were confirmed as significant triggers for headshaking behavior (P ≤ 0.045)
- •Only 12 of 20 enrolled horses completed the trial, suggesting either adverse effects or owner withdrawal