Final answer:
Antihistamines are medications that inhibit itching caused by allergies by preventing histamines from stimulating itching and swelling. They are available in both prescription and over-the-counter strengths and can be used in combination with other anti-inflammatory drugs for more effective treatment.
Step-by-step explanation:
Antihistamines are medications that inhibit itching caused by allergies. They work by preventing histamines that have been released by mast cells from stimulating the itching and swelling of body tissues. Antihistamines can be found in both prescription and over-the-counter strengths, and they are often used in combination with other anti-inflammatory drugs for a more effective treatment.