스펙티노마이신

아미노사이클리톨계 항생제

스펙티노마이신은 **아미노사이클리톨계 항생제**로, 구조적으로 아미노글리코사이드와 유사하지만 아미노당과 글리코사이드 결합이 없습니다. **임상 요점:** * **정균제 vs 살균제:** 진정한 아미노글리코사이드와의 구조적 차이로 인해 스펙티노마이신은 살균제가 아닌 **정균제**로 작용합니다. * **안전성 프로파일:** 기존 아미노글리코사이드(예: 겐타마이신 또는 아미카신)와 흔히 관련된 심각한 신독성 및 이독성이 현저히 낮습니다. * **항균 스펙트럼:** 많은 그람 양성 및 음성균(대장균, 클레브시엘라, 프로테우스, 엔테로박터, 살모넬라, 연쇄상구균, 포도상구균, 마이코플라스마 포함)에 대해 비교적 넓은 스펙트럼을 가집니다. * **한계점:** 혐기성 세균, 대부분의 녹농균, 클라미디아 또는 트레포네마에 대한 활성은 거의 또는 전혀 없습니다. * **주요 용도:** 주로 산업동물(돼지, 가금류, 소)의 호흡기 및 장관계 감염에 사용되며, 개, 고양이, 말에게도 허가 외(off-label)로 간혹 사용됩니다.

작용 기전: Spectinomycin works by binding to the **30S ribosomal subunit** of susceptible bacteria. **Mechanism Pathway:** Drug enters bacterial cell → Binds specifically to the 30S ribosomal subunit → **Inhibits mRNA translation** and translocation → Halts protein synthesis → **Bacteriostatic effect** (prevents bacterial replication and growth). *Note: Unlike true aminoglycosides, spectinomycin does not cause misreading of the messenger RNA, which explains why its action is bacteriostatic rather than bactericidal.*

동물 종별 용량

Cats

For acute infectious gastroenteritis · 5-12 mg/kg · IM · q12h

Cattle

For bronchopneumonia and fibrinous pneumonia · 33 mg/kg · SC · q8h · Suggested withdrawal time is 60 days.
For susceptible infections · 22-39.6 mg/kg/day · IM · divided three times daily
For bovine respiratory disease · 10-15 mg/kg · SC · once daily (q24h) · for 3-5 consecutive days · Inject in the neck; not more than 50 mL per site.

Horses

For susceptible infections · 20 mg/kg · IM · three times daily
For pneumonia · 20 mg/kg · IM · q8h · May cause local myositis. Insufficient data to comment on use.

Birds

For airsacculitis associated with M. meleagridis or chronic respiratory disease associated with E. coli in turkey poults (1-3 days old) · 0.1 mL (10 mg) · SC · once · Inject in the base of the neck.
For control and to lessen mortality due to infections from M. synoviae, S. typhimurium, S. infantis, and E. coli in newly hatched chicks · 2.55 mg/0.2 mL · SC · once · Dilute injection with normal saline to a concentration of 2.55 mg/0.2 mL and inject SC.

투여 경로

POIMSC

금기

Patients with known hypersensitivity to spectinomycin

이상반응

Neuromuscular blockade (reversible with parenteral calcium)
Swelling or soreness at injection sites (especially SC in cattle)
Transient ataxia (reported in turkey poults at high injected doses)
Mild increases in BUN, ALP, and SGPT (reported in humans)
Decreases in hemoglobin, hematocrit, and creatinine clearance (reported in humans)

약물 상호작용

chloramphenicol · Antagonism has been reported when used concurrently.
tetracycline · Antagonism has been reported when used concurrently.

모니터링

Clinical efficacy (resolution of infection symptoms)
Injection site monitoring for swelling or myositis

과용량

Because the drug is negligibly absorbed after oral administration, **significant systemic toxicity is highly unlikely via the oral route**. Injected overdoses may cause neurological or neuromuscular signs. For example, injected doses of 90 mg produced transient ataxia in turkey poults. If severe neuromuscular blockade occurs following massive parenteral overdose, parenteral calcium administration may be required to reverse the blockade.

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