"But we should always be careful when using antihistamines because they may have the opposite affect and make older patients feel wide awake."

Here are some other drug safety guidelines for using pain relievers, antihistamines, and cold medications.

Older adults and women who are pregnant or breast-feeding should talk to their doctors before using antihistamines.

Many doctors do not recommend using antihistamines unless your symptoms are related to having allergies.

Eight patients tried the technique, and all reported using less antihistamines and decongestants.

Do not use nonprescription antihistamines, decongestants, or medicated nasal sprays.

Avoid using antihistamines that are applied directly to the skin.

Using antihistamines over time may also lead to memory impairment.

Take care when using older antihistamines if you need to drive or operate dangerous or heavy machinery.

Talk with your doctor before using antihistamines if you have: