The medication had a positive effect on her health.

These drugs can sometimes effect miraculous cures.

Regular exercise is an effective way to improve your overall health.

She effectively managed the project and completed it on time.

The new policy will come into effect next month.

He made a statement to that effect.

He made a statement to the effect that he would not be attending the meeting.

The effectiveness of this new treatment is still being studied.

The medication may have some side effects.

The stage effect was stunning, with vibrant lights and smoke filling the air.