I've said it before, I'll shout it again:
If you have a dairy allergy, do not take certain tablets of Zyrtec, Benadryl and Singulair. Do not use the inhaler Advair. All contain dairy.
They're not labelled clearly, but a call to the customer service departments of these drugs confirms that those with a milk allergy should not take these forms of the medications.
Allergists, other doctors and pharmacists I've spoken to were unaware of dairy in these tablets and in the inhaler.
Do not take samples of medications in the doctor's office until you have checked all medication ingredients through a label, company website or contacting the company directly.