Methenamine Hippurate
別名: Hiprex, Urex
* **Administration:** Give this medication exactly as prescribed. If your pet experiences stomach upset (vomiting or loss of appetite), try giving the medication **after meals**. * **Dietary Importance:** This drug *only* works if your pet's urine is acidic. It is critical to strictly feed any special prescription diets or administer urinary acidifiers exactly as directed by your veterinarian. * **Compliance:** Do not skip doses. Consistent administration is required to prevent recurrent infections. * **Monitoring:** Your veterinarian will likely need to check your pet's urine pH regularly to ensure the medication is working properly.
劑量必須由獸醫按你寵物的個別情況決定。切勿在沒有獸醫指導下給予人類藥物或其他寵物的處方藥。
用途
- Urinary tract infection prophylaxis
- Urinary tract infection prophylaxis
- Urinary tract infection prophylaxis
- Urinary tract infection prophylaxis
給藥方式
可能的副作用
- Gastrointestinal irritation (nausea, vomiting, anorexia)
- Dysuria (secondary to formaldehyde irritation with long-term use)
- Systemic acidosis (potential)
- Lipoid pneumonitis (reported in humans using oral suspension)
注意事項與禁忌
- Hypersensitivity to methenamine or its salts
- Renal insufficiency
- Metabolic acidosis
- Severe hepatic impairment (due to ammonia production during hydrolysis)
- Severe dehydration
- > **Crucial Efficacy Requirement:** Urine pH MUST be kept below 6.5 (ideally ≤ 5.5) for the drug to be effective. * **Urea-Splitting Bacteria:** Infections with urea-splitting organisms (e.g., *Proteus*, some *Staphylococcus*, *Pseudomonas*) naturally alkalinize the urine, potentially rendering methenamine ineffective. * **Acidification Therapy:** Concurrent use of urinary acidifiers (e.g., methionine, ammonium chloride, ascorbic acid) or prescription acidifying diets is often required. * **Species Sensitivity:** Cats reportedly do not tolerate methenamine as well as dogs. * **Pregnancy:** FDA Category C. Crosses the placenta; use with caution during pregnancy. Enters milk, but no adverse effects reported in nursing offspring.
藥物相互作用
- Sulfamethiazole: Not recommended; an insoluble precipitate may form in the urine.
- Urine Alkalinizing Drugs (e.g., calcium/magnesium antacids, carbonic anhydrase inhibitors, citrates, sodium bicarbonate, thiazide diuretics): May reduce the efficacy of methenamine by preventing its conversion to formaldehyde in the urine.
常見問題
Methenamine Hippurate用於寵物有甚麼用途？
* **Administration:** Give this medication exactly as prescribed. If your pet experiences stomach upset (vomiting or loss of appetite), try giving the medication **after meals**. * **Dietary Importance:** This drug *only* works if your pet's urine is acidic. It is critical to strictly feed any special prescription diets or administer urinary acidifiers exactly as directed by your veterinarian. * **Compliance:** Do not skip doses. Consistent administration is required to prevent recurrent infections. * **Monitoring:** Your veterinarian will likely need to check your pet's urine pH regularly to ensure the medication is working properly.
Methenamine Hippurate對我的寵物安全嗎？
劑量必須由獸醫按你寵物的個別情況決定。切勿在沒有獸醫指導下給予人類藥物或其他寵物的處方藥。
本文僅供一般健康教育，不能取代專業獸醫意見。如寵物身體不適，請諮詢獸醫。