Postviral cough can last for 3–6 weeks. 1. Angiotensin II receptor antagonists frequently cause cough. 2. Many compound cough preparations sold over-thecounter contain sedating antihistamines. 3....

Postviral cough can last for 3–6 weeks.

1. Angiotensin II receptor antagonists frequently cause cough.

2. Many compound cough preparations sold over-thecounter contain sedating antihistamines.

3. Dextromethorphan is a synthetic opioid with cough suppressant, sedative and analgesic activity.