2005 journal article

The effects of inhibiting cytochrome P450 3A, p-glycoprotein, and gastric acid secretion on the oral bioavailability of methadone in dogs

JOURNAL OF VETERINARY PHARMACOLOGY AND THERAPEUTICS, 28(5), 461–466.

MeSH headings : ATP Binding Cassette Transporter, Subfamily B, Member 1 / drug effects; Administration, Oral; Animals; Area Under Curve; Biological Availability; Cross-Over Studies; Cytochrome P-450 CYP3A / drug effects; Cytochrome P-450 CYP3A Inhibitors; Dogs / metabolism; Enzyme Inhibitors / administration & dosage; Enzyme Inhibitors / pharmacology; Female; Gastric Acid / metabolism; Injections, Intravenous / veterinary; Ketoconazole / administration & dosage; Ketoconazole / pharmacology; Male; Methadone / administration & dosage; Methadone / blood; Methadone / pharmacokinetics; Omeprazole / administration & dosage; Omeprazole / pharmacology; Proton Pump Inhibitors
TL;DR: In contrast to its pharmacokinetics humans, methadone has a short elimination half-life, rapid clearance, and low oral bioavailability in dogs and the extent of absorption is not affected by inhibition of CYP3A, p-gp, and gastric acid secretion. (via Semantic Scholar)
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Added: August 6, 2018

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