Should single doses of a serotonin antagonist such as ondansetron be indicated, breastfeeding can be continued as long as the infant is observed for symptoms. The rapid control of the newly discovered human immunodeficiency virus was greatly facilitated by its small genome (only nine genes) and the discovery of a relatively few host proteins important to the virus life cycle.
It took several decades for a substantial body of opinion to realise that undue emphasis on this one approach could be responsible for poor productivity.
In addition, most analgesic-hypnotic combination medications (“” preparations) contain diphenhydramine.
Second-generation nonsedating antihistamine drugs are used primarily for treatment of seasonal, environmental, and other allergic reactions and are not used for the treatment of insomnia.-receptor blockade.
An antihistamine for use in an acute allergic reaction to a food should have a rapid onset of action.
Essentially all of the over-the-counter antihistamine drugs marketed for insomnia treatment include diphenhydramine, the prototype of this class, or doxylamine.
Syrup for small children and rapidly dissolving tablets that can be taken without liquids are best suited for this purpose.
Although the number of doses to be used in this circumstance would be expected to be small, an inexpensive generic formulation would also be preferable. It has an onset of action as fast as diphenhydramine, and is also available in syrup and rapidly dissolving tablet formulations.
H1-receptor antagonists inhibit most of the effects of histamine on smooth muscles, especially the constriction of respiratory smooth muscle.
H1-receptor antagonists affect various inflammatory and allergic mechanisms.
Antihistaminics and other compounds are used as antiemetics.