Phenylbutazone toxicity in ponies.

The research paper discusses the consequences of the toxicity of phenylbutazone, a drug, given orally at about 10 mg/kg/day for 1-2 weeks in ponies, with symptoms like anorexia, depression, and abdominal swelling. Notably, blood biochemistry revealed a drop in total plasma protein and calcium but a rise in urea quantities. Three ponies succumbed to shock resulting from large intestine submucosal edema, and were also found with oral ulcers. In an examination of two ponies given phenylbutazone intravenously at 4.0 mg/kg for a week, a notable decline in total plasma protein was seen in one.

Phenylbutazone Toxicity in Ponies

• The study focuses on phenylbutazone toxicity in ponies. This drug, given to the ponies orally at a dosage rate of approximately 10 mg per kg per day for a period between seven to 14 days, led to observable effects of toxicity in seven of the eight ponies treated.
• Common symptoms of this toxicity included anorexia (loss of appetite), a state of depression, and abdominal oedema (accumulation of fluid in the abdominal cavity, causing swelling).

Changes in Blood Biochemical Determinants

• Following the administration of phenylbutazone, changes in blood biochemical determinants were noted where total plasma protein and calcium concentrations decreased significantly.
• An increase in urea concentration was also observed. Such changes hinted at water retention in the body of the ponies, which is unhealthy and can lead to severe medical conditions.

Mortality and Necropsy Findings

• Interestingly, death occurred in three of the ponies during the treatment, following the development of shock. This shock was attributed to submucosal oedema of the large intestine, as discovered during necropsy (examination after death).
• Apart from the intestinal oedema, oral ulceration was found in these ponies. That alludes to the damaging effects of the phenylbutazone drug when given in high doses.

Effects of Intravenous Administration of Phenylbutazone

• The research also considered the effects of administering phenylbutazone intravenously: a method that introduces the drug directly into the bloodstream, thus skipping the digestion process.
• The dosage given was 4.0 mg per kg, for seven days. In one of the two ponies administered this way, a significant decrease in total plasma protein concentration was observed. This indicates the adverse effects phenylbutazone might have on blood health, regardless of the mode of administration.