It is very important that your doctor check your progress after you finish the medicine. This is to make sure the malaria is cleared up completely, and to allow your doctor to check for any unwanted effects. Blood tests may be needed to check for unwanted effects.
This medicine can cause changes in the heart rhythm, such as a condition called QT prolongation. It may change the way your heart beats and cause fainting, dizziness, or serious side effects in some patients. Call your doctor right away if you have any symptoms of heart rhythm problems, such as fast, pounding, or uneven heartbeats.
Quinine may cause hypoglycemia (low blood sugar). If your blood sugar gets too low, you may feel weak, drowsy, confused, anxious, or very hungry. You may also sweat, shake, or have blurred vision, a fast heartbeat, or a headache that will not go away. Tell your doctor right away if you have any of these symptoms.
This medicine may cause serious allergic reactions, including anaphylaxis. Anaphylaxis can be life-threatening and requires immediate medical attention. Call your doctor right away if you have a rash; itching; hoarseness; lightheadedness, dizziness, or fainting; trouble with breathing; trouble with swallowing; or any swelling of your hands, face, or mouth after you take this medicine.
Quinine may cause blurred vision or a change in color vision. Make sure you know how you react to this medicine before you drive, use machines, or do anything else that could be dangerous if you are not able to see well. If these reactions are especially bothersome, check with your doctor.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.