Final answer:
To calculate the number of tablets needed for a 30-day supply, multiply the daily dosage by the number of times the medication is taken per day and the number of days in the supply period.
Step-by-step explanation:
To calculate the number of tablets needed for a 30-day supply, we need to determine the total dosage required in that period. The dosage is 15 mg per kilogram of body weight, and the patient weighs 25 kilograms. So the total dosage per day is 15 mg/kg * 25 kg = 375 mg. Since the medication is given every 8 hours, there are 24 hours in a day, so the patient will take the medication 24/8 = 3 times a day. Therefore, the total dosage per day is 375 mg * 3 = 1125 mg.
Now, we need to find out how many tablets of 125 mg are needed to reach the total dosage. To do this, we divide the total dosage per day by the tablet dosage: 1125 mg / 125 mg = 9 tablets.
Since a 30-day supply is needed, we multiply the number of tablets needed for one day by 30: 9 tablets * 30 days = 270 tablets.