These effects are mainly caused by the older first-generation antihistamines which are described below.
Note: antihistamines should not be confused with H2 blockers which reduce the production of stomach acid.
If these receptors are affected, you may experience some of the side-effects associated with antihistamines.
For example, dry mouth, blurred vision and retention of urine.
For example: For other conditions, specific antihistamines may be used.
Some of these medicines are available to buy over the counter from your pharmacist. These medicines come in a variety of forms, as mentioned above.Your doctor or pharmacist will advise you on how to take your medication, including what dose and how often.Read the leaflet that comes with your particular brand for further information.Antihistamines are also used in the treatment of feeling sick (nausea) and being sick (vomiting).However, the exact way that they ease these symptoms is not fully understood.