Faculty Articles

Title

Adrenaline (epinephrine) microcrystal sublingual tablet formulation: enhanced absorption in a preclinical model

Publication Title

The Journal of pharmacy and pharmacology

Volume

67

Issue

1

Publication Date / Copyright Date

1-1-2015

First Page

20

Last Page

25

DOI Number

10.1111/jphp.12312

Abstract

OBJECTIVES: For anaphylaxis treatment in community settings, adrenaline (epinephrine) administration using an auto-injector in the thigh is universally recommended. Despite this, many people at risk of anaphylaxis in community settings do not carry their prescribed auto-injectors consistently and hesitate to use them when anaphylaxis occurs.The objective of this research was to study the effect of a substantial reduction in adrenaline (Epi) particle size to a few micrometres (Epi microcrystals (Epi-MC)) on enhancing adrenaline dissolution and increasing the rate and extent of sublingual absorption from a previously developed rapidly disintegrating sublingual tablet (RDST) formulation in a validated preclinical model.

METHODS: The in-vivo absorption of Epi-MC 20 mg RDSTs and Epi 40 mg RDSTs was evaluated in rabbits. Epi 0.3 mg intramuscular (IM) injection in the thigh and placebo RDSTs were used as positive and negative controls, respectively.

KEY FINDINGS: Epimean (standard deviation) area under the plasma concentration vs time curves up to 60 min and Cmax from Epi-MC 20 mg and Epi 40 mg RDSTs did not differ significantly (P > 0.05) from Epi 0.3 mg IM injection. After adrenaline, regardless of route of administration, pharmacokinetic parameters were significantly higher (P < 0.05) than after placebo RDSTs administration (reflecting endogenous adrenaline levels).

CONCLUSION: Epi-MC RDSTs facilitated a twofold increase in Epi absorption and a 50% reduction in the sublingual dose. This novel sublingual tablet formulation is potentially useful for the first-aid treatment of anaphylaxis in community settings.

Disciplines

Medicine and Health Sciences | Pharmacy and Pharmaceutical Sciences

Keywords

Administration, Sublingual, Anaphylaxis, Animals, Area Under Curve, Chemistry, Pharmaceutical, Epinephrine, Female, Injections, Intramuscular, Metabolic Clearance Rate, Particle Size, Prospective Studies, Rabbits, Tablets

Peer Reviewed

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