Food Effects on the Pharmacokinetics of Doxylamine Hydrogen Succinate 25 mg Film-Coated Tablets

Abstract

Background: Doxylamine succinate, an ethanolamine-based antihistamine, is used in the short-term management of insomnia because of its sedative effects. The data available on the pharmacokinetic profile of doxylamine in humans are limited, notwithstanding that this drug has been marketed in European countries for more than 50 years. In fact, no data on the effect of food on the pharmacokinetic parameters of doxylamine are available. Objective: The objective of this study was to evaluate the pharmacokinetic parameters of doxylamine following a single oral dose of doxylamine hydrogen succinate 25 mg in healthy human subjects under fed and fasting conditions. Study Design: This was a single-center, randomized, single-dose, laboratoryblinded, two-period, two-sequence, crossover study. Setting: The study was conducted in a phase I clinical unit. Subjects and Methods: A single oral dose of doxylamine hydrogen succinate 25 mg (equivalent to 17.4 mg of doxylamine base) was administered to healthy volunteers under either fed conditions (high-fat, high-calorie food intake) or fasting conditions in each study period. The drug administrations were separated by a wash-out period of seven calendar days. Plasma samples were collected for up to 60 hours postdose, and plasma doxylamine concentrations were determined by a high-performance liquid chromatography method with tandem mass spectrometry detection. Pharmacokinetic parameters were calculated using noncompartmental analysis. Safety was evaluated through assessment of adverse events, standard laboratory evaluations, vital signs, and 12-lead electrocardiography. Results: In total, 24 healthy subjects (12 male and 12 female) were included in the study. Doxylamine succinate 25 mg tablets exhibited similar oral bioavailability of doxylamine in the fasting state (mean maximum plasma drug

Computational Analysis of Structure-Based Interactions for Novel H1-Antihistamines

“…For instance, histamine in CNS is closely connected with a wide spectrum of functions, like the regulation of arousal and the sleep-wake cycle, appetite control, satiation, nociception and cognition [ 6 ]. Antihistamines were first introduced in the 1940s and represent one of the most commonly-used medications today [ 7 ]. This is just due to the specific histamine-blocking capability and marked sedative effects; H 1 -antihistamines are often used for sleep promotion nowadays [ 8 ].…”