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My 2 year old was prescribed, by her pediatrician, Robitussin for her cough to take at night. She also takes Singular, Zyrtec, and Dimetapp elixir at night time, which were prescribed for allergies. I was just wondering if these were all okay to take together? Wanting to know before I start Robitussin.

The only possible direct drug interaction between these medications concerns the duplication of antihistamines. Both the Zyrtec (cetirizine) and Dimetapp (brompheniramine) are antihistamines. Be sure the doctor meant for you to give both of these the same day. 

The Robitussin (guaifenesin) is an expectorant. Be sure to give the child plenty of water. This will help to keep the secretions loose. 

The Singulair (montelukast) should be given at the same time each day to work effectively. Never give more than the physician orders for the child.

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