Avoid taking other anti-malaria medications without your doctor's advice. This includes chloroquine, halofantrine, and mefloquine.
Avoid using antacids without your doctor's advice. Use only the type of antacid your doctor recommends. Some antacids can make it harder for your body to absorb quinine.
Quinine may cause blurred vision and may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert and able to see clearly.
Do not use quinine to treat any condition that has not been checked by your doctor.
