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Chapter 55 – Skin Conditions (QE) Sample Questions

1. A mother presents to the pharmacy seeking treatment for head lice for her 7-year-old daughter. She reports that her child has a severe allergy to ragweed and chrysanthemums. Which of the following pharmacological treatments is CONTRAINDICATED for this patient?
  1. A. Isopropyl myristate (Resultz®)
  2. B. Dimethicone 50% (NYDA®)
  3. C. Permethrin 1% (Nix®)
  4. D. Pyrethrins/piperonyl butoxide
Answer
Ans: D
Explanation: According CPS (Canadian pediatric society) guidelines, Pyrethrin is contraindicated in chrysanthemum allergy, possible ragweed allergy due to cross-sensitivity.
Pyrethrins/piperonyl butoxide(R&C shampoo) Contraindicated in patients allergic to ragweed, chrysanthemums or other pyrethrin products.Dimethicone and isopropyl myristate are safer alternatives because they act by physical mechanisms, not neurotoxicity.
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