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It is the most common of the physical urticarias and it affects about 5 percent of the population. This condition sometimes also occurs along with other forms of hives.There are at least four major neurotransmitters of the vestibular system involved in the "three neuron arc" between the vestibular hair cells and oculomotor nuclei that drives the vestibulocular reflex.Usually, the patients figure out the cause by themselves, and they never bother coming to a doctor.Certain people can develop recurrent hives from sunlight, cold, pressure, vibration or exercise. If hives develop from scratching or firmly rubbing the skin it is called dermatographism.Some people get repeated attacks that occur as an allergic reaction to a variety of things (foods, most commonly nuts, chocolate, fish, tomatoes, eggs, fresh berries and milk, insect stings, and medications).In this case, they usually break out within a few hours of the exposure.Side effects might include daytime drowsiness, dry mouth and dizziness.
In the event of an overdose or if combined with another sedative, many of these drugs can cause unconsciousness (see hypnotic) and even death.
Diphenhydramine and doxylamine have anticholinergic properties that make them poor choices for older adults.