EUTHASOL Solution for Injection


Target species

  • Cat
  • Cattle
  • Dog
  • Horse
  • Pig

Package size

Vial of 100 & 250 ml

Active substance

400mg/ml pentobarbital sodium

For use in animal for humane, painless, and rapid euthanasia.

Active ingredients pentobarbital sodium and phenytoin sodium result in humane, painless, and rapid euthanasia.

  • Indicated for use in dogs to induce painless, humane, and rapid euthanasia resulting from cerebral death triggered by active ingredients pentobarbital sodium and phenytoin sodium.
  • Intravenous (IV) administration produces rapid anesthetic action and smooth, quick onset of unconsciousness.
  • Dosage is 1 mL per 10 lb of body weight.
  • IV administration is preferred. Intracardiac injection is also possible.
  • Available in 100 mL, and 250 mL multiple-dose vials.

WARNING: For canine euthanasia only. Must not be used for therapeutic purposes. Do not use in animals intended for food.




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What is the Euthasol Solution?

Euthasol Solution is a non-sterile solution containing pentobarbital sodium and phenytoin sodium as the active ingredients. Rhodamine B, a bluish-red fluorescent dye, is included in the formulation to help distinguish it from parenteral drugs intended for therapeutic use. Although the solution is not sterile, benzyl alcohol, a bacteriostat, is included to retard the growth of microorganisms.

Each mL contains:

  • Active ingredients: 390 mg pentobarbital sodium (barbituric acid derivative), 50 mg phenytoin sodium;
  • Inactive ingredients: 10% ethyl alcohol, 18% propylene glycol, 0.003688 mg rhodamine B, 2% benzyl alcohol (preservative), water for injection q.s. Sodium hydroxide and/or hydrochloric acid may be added to adjust pH.

Euthasol Solution Actions

EUTHASOL® Euthanasia Solution (pentobarbital sodium and phenytoin sodium) contains two active ingredients which are chemically compatible but pharmacologically different. Each ingredient acts in such a manner so as to cause humane, painless, and rapid euthanasia. Euthanasia is due to cerebral death in conjunction with respiratory arrest and circulatory collapse. Cerebral death occurs prior to cessation of cardiac activity.

When administered intravenously, pentobarbital sodium produces rapid anesthetic action. There is a smooth and rapid onset of unconsciousness. At the lethal dose, there is depression of vital medullary respiratory and vasomotor centers.

When administered intravenously, phenytoin sodium produces toxic signs of cardiovascular collapse and/or central nervous system depression. Hypotension occurs when the drug is administered rapidly.

Pharmacodynamic Activity

The sequence of events leading to humane, painless, and rapid euthanasia following intravenous injection of EUTHASOL Euthanasia Solution is similar to that following intravenous injection of pentobarbital sodium, or other barbituric acid derivatives. Within seconds, unconsciousness is induced with simultaneous collapse of the dog. This stage rapidly progresses to deep anesthesia with concomitant reduction in the blood pressure. A few seconds later, breathing stops, due to depression of the medullary respiratory center; encephalographic activity becomes isoelectronic, indicating cerebral death; and then cardiac activity ceases.

Phenytoin sodium exerts its effect during the deep anesthesia stage caused by the pentobarbital sodium. This ingredient, due to its cardiotoxic properties, hastens the stoppage of electrical activity in the heart.

Euthasol Solution: Dosage and Administration

Dosage:Dogs, 1 mL for each 10 pounds of body weight.


Intravenous injection is preferred. Intracardiac injection may be made when intravenous injection is impractical, as in a very small dog, or in a comatose dog with impaired vascular functions. Good injection skill is necessary for intracardiac injection.

The calculated dose should be given in a single bolus injection.

For intravenous injection, a needle of sufficient gauge to ensure intravenous placement of the entire dose should be used.

The use of a Luer-Lok® syringe is recommended to prevent accidental exposure due to needle/syringe separation.


EUTHASOL Euthanasia Solution is available in 100 and 250 mL multiple dose vials.

STORAGE at controlled room temperature of between 20° and 25°C (68° and 77°F), with excursions permitted between 15° to 30°C (59° to 86°F).

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