Trimethoprim BP(vet)…….8% w/v Suphadiazine BP (vet)…….40% w/v Sulfamethoxazole/trimethoprim is given by mouth with or without food in the form of a tablet or liquid suspension or solution. If your pet vomits or acts sick after receiving the medication on an empty stomach, give the next dose with a meal or treat. The liquid suspension should be shaken well before use and does not need to be refrigerated. There is also an injectable form that is used in exotic pets and given in the muscle or under the skin. Allow free choice access to water, as pets should not be allowed to become dehydrated while on this medication. This medication will take effect quickly, in about 1 to 2 hours, but visible effects may take a few days to be observed. People with allergies to sulfa compounds should avoid handling this medication or should use gloves while administering this medication. Sulfamethoxazole/trimethoprim should not be used in dogs with liver tissue damage, blood cell problems, dogs that are dehydrated or at an increased risk for urinary stones, or those allergic to sulfonamides. It should be used cautiously in Doberman Pinschers as they may be more susceptible to adverse side effects. It should be used with caution in pets with liver or kidney disease; old, sick, or debilitated pet; or pets with a folate deficiency. Sulfamethoxazole/trimethoprim should be used cautiously in pregnant and nursing pets, and should not be used in are near the end of their pregnancy.