Effects of methysergide and loratadine on food intake, mood, and performance of humans living in a residential laboratory.

Abstract:

:The effects of loratadine, a peripherally acting histamine (H1) antagonist, and methysergide, a serotonin (5-HT) antagonist, were evaluated in seven normal-weight, male research volunteers, participating in a placebo-controlled, double-blind, 17-day residential study. Participants received oral loratadine (10 or 20 mg), methysergide (4 or 8 mg), or placebo at 1000 and 1700 hours daily. Active drug was administered on Days 4, 5, 7, 8, 11, 12, 15, and 16; placebo was administered on all other days. Drug and dose order were counterbalanced across participants. Food intake, performance, and subjective ratings were measured repeatedly throughout the day. Loratadine had no effect on food intake, performance, or subjective ratings. In contrast, total caloric intake significantly decreased from approximately 3500 kcal during placebo administration to 3065 kcal on the first but not the second day of methysergide administration. Consumption of carbohydrate (p < 0.055), protein, and fat decreased on the first day of methysergide administration. This decrease in food intake was due to a decrease in meal size; the number of meals consumed was not affected. The proportion of calories derived from carbohydrates significantly increased on the first day of methysergide administration. Methysergide also significantly impaired performance of a psychomotor task on the first day of high-dose administration and increased ratings of several subjective measures, including "Vomiting," "Stomach Pain," and "Miserable." These results suggest that the anorectic effect occurred as a result of the somatic and mood changes produced by methysergide. In addition, the inability of loratadine to affect food intake indicates that antagonism of central histamine receptors may be responsible for the increases in food intake produced by other antihistamines (e.g., diphenhydramine).

journal_name

Physiol Behav

journal_title

Physiology & behavior

authors

Comer SD,Haney M,Ward AS,Fischman MW,Foltin RW

doi

10.1016/s0031-9384(98)00046-8

subject

Has Abstract

pub_date

1998-05-01 00:00:00

pages

159-64

issue

2

eissn

0031-9384

issn

1873-507X

pii

S0031-9384(98)00046-8

journal_volume

64

pub_type

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