If you suffer from allergies, you have likely taken antihistamines to alleviate your symptoms. There are many antihistamines available over-the-counter these days. They can be divided into two general categories: first generation and second generation. First-generation antihistamines tend to cause more side effects than second-generation ones. These side effects include drowsiness, muddled thinking and dry mouth and eyes. Armed with this knowledge about antihistamines, deciding which one is right for you becomes easier.
Step 1
Determine the active ingredient of the drug to see if it is a first-generation or
second-generation antihistamine. You can find this information on the drug's packaging. First-generation antihistamines include brompheniramine, chlorpheniramine, dimenhydrinate and doxylamine. Second-generation antihistamines include loratadine and cetirizine.
Step 2
Read the other ingredients. Many antihistamines are packaged with decongestants and pain relievers that might have their own side effects separate from those of the antihistamine.
Step 3
Read about the side effects on the packaging. Since drug makers often mix pain relievers and decongestants with antihistamines, these combinations can give rise to unique side effects not necessarily associated with any one drug alone. Be sure to read the full list of side effects for any drug concoction you are planning to take.
Step 4
Look at the price tags. Second-generation antihistamines will often cost more per bottle than first-generation antihistamines. But keep in mind that you generally have to take first-generation antihistamines more often since they are shorter-lasting, so generic versions of second-generation antihistamines can end up being the most economical choice.
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