Over-the-counter antihistamines are effective. Benadryl works well but can make you drowsy. Claritin is a non-sedating antihistamine and is now sold over the counter. Antihistamine/decongestant combinations are also effective. Their effectiveness can be increased by not using a single preparation for longer than a couple of weeks. Cromolyn is available over the counter with the name Nasalcrom, and it is effective but must be used four times a day or more.