Methadone Hydrochloride

31 adverse event reports submitted to the FDA

Important: Adverse event reports do not establish that a drug caused or contributed to the event. Consult your veterinarian before making treatment decisions.

Total Reports

Deaths Reported

1290.0%

Death Rate

Active Ingredients

Methadone Hydrochloride

Administration Routes

UnknownIntravenousIntramuscularSubcutaneous

Species Affected

Dog 23

Cat 8

Most Affected Breeds

Pug 4

Dog (unknown) 4

Domestic Shorthair 2

Unknown 2

Cat (unknown) 2

Retriever - Labrador 1

Schnauzer (unspecified) 1

Beagle 1

Bengal 1

Chow Chow 1

Most Reported Reactions

Death 4

Lethargy (see also Central nervous system depression in Neurological) 4

Tachycardia 4

Anaphylaxis 4

Lack of efficacy - NOS 3

Apnoea 3

Cardiac arrest 3

Regurgitation 3

Anorexia 3

Conjunctival oedema 3

Hyperthermia 3

Pale mucous membrane 3

Outcome Breakdown

Recovered/Normal

19 (61.3%)

Outcome Unknown

5 (16.1%)

Died

4 (12.9%)

Ongoing

3 (9.7%)

Source: FDA Center for Veterinary Medicine — Adverse Event Reports. Data reflects voluntary submissions and may not represent actual incidence rates.