How to Prepare for Being Skin Tested

Please follow these directions when getting ready for this test. All antihistamines may affect the results of skin testing and therefore need to be stopped before the testing is done. If the antihistamines are not stopped, testing may be delayed resulting in the need for another clinic visit for skin testing.

Please stop these antihistamines for the length of time listed before your appointment at the Oklahoma Allergy & Asthma Clinic.

Stop these antihistamines for 5 days before your appointment:

  • Allegra®(Fexofenadine)
  • Atarax®, Vistaril® (Hydroxyzine)
  • Zyrtec® (Cetirizine)
  • XyZal® (Levocetirizine)

Stop these antihistamines 3 days before your appointment:

  • Actifed®, Dimetapp® (Brompheniramine)
  • Astelin®, (Azelastine)
  • Astepro® (Azelastine)
  • Benadryl® (Diphenhydramine)
  • Chlortrimeton® (Chlorpheniramine)
  • Claritin® (Loratadine)
  • Clarinex® (Desloratadine)
  • Patanase® (Olopatadine)
  • Phenergan® (Promethazine)
  • Rescon® (Chlorpheniramine/methscopolamine/phenylephrine)
  • Respa® (Guaifenesin/phenylephrine)
  • Rynatan® (Chlorpheniramine, Phenylephrine)
  • Tavist®, Antihist® (Clemastine)
  • Actifed®, Aller-Chlor®, Bromfed®, Drixoral®, Dura-tab®, Novafed-A®, Ornade®, Poly-Histine-D®, Trinalin® (Combination Medicines)

If you are taking an antihistamine that is not listed please stop the medicine for 3 days before your appointment. If you are not sure if the medicine you are taking is an antihistamine, ask your doctor.

Sometimes antidepressants can also act as an antihistamine. Let your doctor know if you are on any antidepressants before your skin testing.

Do not take your asthma medications the morning of your appointment so that a more accurate pulmonary function test can be done.

If you are being seen for chronic hives, you do not have to stop taking your antihistamines.

Continue to take all your other non-allergy medicine from your other physicians, according to your regular, daily schedule.