Do not take this medication if the packet is swollen or the granules have turned dark brown or purple instead of tan. This may be a sign that the medication has not been properly stored. See also Storage section.

Take this medication by mouth as directed by your doctor, usually 2 to 3 times daily. This medication needs to be taken with an acidic food to properly work in your body. Open the packet and sprinkle your dose onto an acidic food such as applesauce, yogurt, or juice (such as tomato, orange, grapefruit, grape, cranberry, apple juice, or punch). Do not mix in other foods. If the granules are mixed in juice, stir to suspend the granules and drink all of the mixture right away. The granules will not dissolve in the prepared mixture. Do not crush or chew the granules before or while swallowing. Do not prepare a supply in advance. Ask your doctor or pharmacist if you have any questions about how to take this medication.

Dosage is based on your medical condition, age, and response to treatment.

For the best effect, take this antibiotic at evenly spaced times. To help you remember, take this medication at the same time every day.

Continue to take this medication until the full prescribed amount is finished, even if symptoms disappear after a few days. Stopping the medication too early may result in a return of the infection.

Tell your doctor if your condition does not improve or if it worsens.