Why must NSAID use be cautious in dehydrated or kidney-compromised animals?

• A. Increased risk of renal injury and GI ulcers; ensure hydration and organ function.
• B. NSAIDs are safe without monitoring.
• C. Hydration is irrelevant.
• D. They only affect the liver.

Answer: (A)

NSAIDs can compromise both kidney perfusion and the stomach’s protective lining, so using them in dehydrated or kidney-compromised animals requires caution. They work by inhibiting COX enzymes, which lowers prostaglandin production. Prostaglandins help dilate the afferent arteriole in the kidneys and support renal blood flow, especially when the body is volume-depleted. In dehydration, that prostaglandin-mediated support is crucial to maintaining a healthy GFR; blocking it can drop kidney filtration further and raise the risk of acute kidney injury, particularly if the kidneys are already compromised.

At the same time, prostaglandins also protect the gastric mucosa. Reducing their production with NSAIDs diminishes this protective effect, increasing the likelihood of GI ulcers and bleeding.

Because of these dual risks, it’s essential to assess hydration status and renal function before giving NSAIDs, ensure adequate fluid status, monitor kidney parameters, and consider alternative analgesia or adjusted dosing in animals with dehydration or kidney disease. The other statements don’t fit because NSAIDs are not inherently safe without monitoring, hydration status matters, and they do not primarily affect the liver in this scenario—the kidneys and GI tract are the main concerns.