Several: Claritin, (loratadine) Allegra and zyrtec are safe and tend to cause less drowsiness than other antihistamines. Excessive drowsiness with diazepam can occur with chlorpheniramine or brompheniramine which are in many over the counter allergy medications. There is a theoretic concern of thickening sputum and causing more airflow obstruction.
Answered 9/15/2018
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