Consult a doctor before taking this medicine if the patient has hyperoxaluria (an excessive excretion of oxalate in the urine) or a condition known as glucose-6-phosphate dehydrogenase (G6PD) deficiency.
When to consult a Doctor: If the symptoms persist or worsen after a few days of taking this medicine, or if the patient is experiencing an adverse reaction to this medicine, it would be best to consult the doctor as soon as possible.