Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.
Before taking this medicine
You should not take granisetron if you are allergic to it.
To make sure granisetron is safe for you, tell your doctor if you have:
heart disease;
a heart rhythm disorder;
a personal or family history of long QT syndrome;
an electrolyte imbalance (such as low levels of potassium or magnesium in your blood); or
if you have recently had stomach or intestinal surgery.
It is not known whether  granisetron will harm an unborn baby. Tell your doctor if you are pregnant.
It is not known whether granisetron passes into breast milk or if it could harm a nursing baby. Tell your doctor if you are breast-feeding a baby.
Granisetron is not approved for use by anyone younger than 18 years old.
