Take this medicine only as directed by your doctor. Do not take more of it, do not take it more often, and do not take it for a longer time than your doctor ordered.
It is best to take this medicine with food to help prevent vomiting and loss of appetite.
This medicine is usually given with folinic acid to help prevent blood problems. If you are using a combination of medicines, it is important that you take each medicine at the right time. Follow your doctor's instructions on when to take these medicines.
Take all of the medicine in your prescription to clear up your infection, even if you feel better after the first few doses.
The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
For oral dosage form (tablets):
For treatment of toxoplasmosis:
Adults—At first, 50 to 75 milligrams (mg) of pyrimethamine together with 1 to 4 grams (g) of sulfonamide once a day for 1 to 3 weeks. Your doctor may adjust your dose as needed and tolerated.
Children—Dose is based on body weight and must be determined by your doctor. The starting dose is usually 1 milligram (mg) per kilogram (kg) of body weight per day, given in 2 divided doses. Your doctor may adjust the dose as needed and tolerated.
If you miss a dose of this medicine, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not double doses.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Ask your healthcare professional how you should dispose of any medicine you do not use.