It is important that your doctor check your progress after treatment. This is to make sure that the infection is cleared up completely, and to allow your doctor to check for any unwanted effects.
If your symptoms do not improve after you have taken this medicine for the full course of treatment, or if they become worse, check with your doctor.
For patients taking piperazine for pinworms:
In some patients, pinworms may return after treatment with piperazine. Washing (not shaking) all bedding and nightclothes (pajamas) after treatment may help to prevent this.