Acetic Acid
**Acetic acid** (commonly known as vinegar in its 3-5% diluted form) is a gastrointestinal acidifier used primarily in large animal medicine. * **Ruminants**: Serves as a life-saving treatment for non-protein nitrogen (e.g., urea) induced ammonia toxicosis. * **Horses**: Used prophylactically to prevent enterolith (intestinal stone) formation by reducing colonic pH. > **Clinical Pearl**: Always verify the concentration! Standard grocery store distilled white vinegar is typically 3-5% acetic acid and is the safest, most accessible form for emergency veterinary use. Concentrated forms (like glacial acetic acid) are highly corrosive and must be handled and diluted with extreme caution.
Mechanism: The primary mechanism of action relies on altering the pH of the gastrointestinal tract: * **Ion Trapping (Ruminants)**: Lowers rumen pH → shifts toxic, un-ionized ammonia (NH3) to the ionized ammonium ion (NH4+) → **NH4+ cannot easily cross cell membranes**, significantly reducing systemic absorption of toxic ammonia into the bloodstream. * **Enzyme Inhibition**: Slows the hydrolysis of urea by rumen microbes. * **Mineral Solubility (Horses)**: Lowering the colonic pH increases the solubility of minerals (such as magnesium and phosphorus), preventing them from precipitating and forming **enteroliths**.
Dosing by species
- Treatment of urea poisoning · Infuse 5% acetic acid (vinegar) into rumen; may be repeated as necessary if clinical signs reoccur · Intraruminal · As needed · Dose volume not explicitly specified for sheep in monograph, but indicated for ruminants generally.
- Treatment of urea poisoning · Infuse 5% acetic acid (vinegar) into rumen; may be repeated as necessary if clinical signs reoccur · Intraruminal · As needed · Dose volume not explicitly specified for goats in monograph, but indicated for ruminants generally.
- Putrefaction of rumen associated with a high rumen pH · 4-10 liters of vinegar · PO/Intraruminal · Once
- Treatment of urea poisoning · 2-6 liters into rumen · Intraruminal · may be repeated as necessary if clinical signs reoccur · Using 5% acetic acid (vinegar). Recovery ranges from 8-24 hours. A post-recovery pro-biotic rumen inoculation may enhance the gain and productivity of urea poisoned animals.
- Enterolith prevention · 250 mL/450 kg body weight PO · PO · once daily · Using vinegar.
Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.
Routes of administration
Contraindications
- Potential lactic acidosis (grain overload, rumen acidosis)
Adverse effects
- Mucous membrane irritation
- Unpleasant taste
Drug interactions
- Oral medications · Due to its acidic qualities, it could potentially affect the degradation or absorption of several drugs in the gut.
Monitoring
- Rumen pH
- Clinical signs of ammonia toxicosis (e.g., tremors, tachypnea, convulsions)
- Resolution of clinical signs
Overdose
When used for appropriate indications, there is little likelihood of serious toxicity occurring after minor overdoses. Due to its potential corrosiveness, the greatest concern would occur if a concentrated form of acetic acid (e.g., glacial acetic acid) was mistakenly used instead of a diluted form (3-5%).
VetSheet drug reference is intended for licensed veterinary professionals as a clinical decision-support aid, not a substitute for professional judgement or the manufacturer’s current label.