头痛是这种药物的一个副作用。

Headaches are one ___side ___effect of this drug.

新疗法旨在避免任何有害的副作用。

The new treatment is designed to avoid any harmful ___side ___effects.

患者在服药前应了解潜在的副作用。

Patients should be aware of the potential ___side ___effects before taking the medication.