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My sister has food allergies (especially nuts, eggs, seafood). Problem occurred when she accidentally ate something without knowing it has eggs in it. Allergic reaction occurs and she did not have her clarinex, so some person at that party gave her claritin. Can she use claritin as a substitute for clarinex?

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That person did a good thing, because those two meds have a very similar effect, both are antihistamines. They block histamine receptors, but do not react with already free histamine. So, if she has some severe allergic reactions, she must take a shot of corticosteroid and aminophylline and to see a doctor, of course. Allergic reactions could be very serious.
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Yes.  They are technically the same drugs. Claritin is a double bonded molecule with one molecule being active and the other inactive. The drug company decided to break up the two molecules and remove the inactive one in order to create a new "patented" blockbuster drug (Clarinex). Thus 10mg of Claritin is equal to only 5mg of Clainex. There is little if any evidence to support one being stronger or better tolerated then the other. HTope this help!

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