The common cough syrups need to be taken 4 to 6 hours. An alternative is to take a timed-release cough suppressant that lasts 8 to 12 hours between doses.

• 一般止咳糖浆需4到6小时服用一次。变通的办法是服用可以持续8到12小时缓慢释放药力的止咳药。