Drugs To Be Withheld Before Diagnostic Tests

Medications

Skin Testing

“Non-Sedating” Antihistamines:
Astemizole (Hismanal), Cetirizine (Zyrtec), Loratadine (Claritin), Fexofenadine (Allegra)

Withhold for 2 weeks before testing.

Antidepressants that have antihistamine effect:
Amitriptyline (Elavil), Clomipramine (Anafranil),Doxepin (Sinequan), Imipramine (Tofranil), Trimipramine (Surmontil), Amoxapine (Asendin), Desipramine, (Nurpramin), Nurtriptyline (Pamelor, Aventyl), Protriptyline (Vivactil), Maprotiline (Ludiomil), Mirtazapine (Remeron), Trazodone (Desyrel), Nefazadone (Serzone)

Withhold for 2 weeks before testing.

Miscellaneous Anti-Anxiety Agents:
Hydroxyzine (Vistaril, Atarax), Alprazolam (Xanax), Clonazepam(Klonopin)

Withhold for 1 weeks before testing.

Herbal Supplements:
Astragalus, Licorice, Green Tea, Milk Thistle, Saw Palmetto, St. John’s Wort, Feverfew

Withhold for 1 weeks before testing.

Antihistamines:
Diphenhydramine (Benadryl), Chlorpheniramine (Chlor-Trimeton), Brompheniramine (Dimetapp), Clemastine (Tavist, Antihist), Combination Drugs (Actifed, Drixoral, Trinalin), and Midol

Withhold for 2 weeks before testing.

Topical Steroid Anti-Inflammatories:
Creams, ointments, gels, solutions, lotions

Withhold morning of test

Histamine Blockers:
Cimetidine (Tagamet), Ranitidine (Zantac), Nizatidine (Axid), Famotidine (Pepcid)

Withhold morning of test

Leukotriene Receptor Agonists:
Montelukast (Singulair), Zileuton (Zyflo), Zafirlukast (Accolate)

Withhold the night before and the morning of test

Miscellaneous:
Cisapride (Propulsid), Metoclopramide (Reglan)

Prochlorperazine (Compazine)

Withhold morning of test

Withhold for 3 days

**Please check with your prescribing provider before discontinuing any medications.**