Final answer:
The patient needs to take one 100 mg capsule of Dilantin per dose to reach the total daily prescribed dosage of 0.3 g.
Step-by-step explanation:
To calculate how many capsules of Dilantin a patient should take per dose when the total daily dosage is 0.3 g and the medication comes in 100 mg capsules, a simple conversion is required. Since there are 1000 mg in a gram, the daily dose of 0.3 g is equivalent to 300 mg. With the available Dilantin capsules being 100 mg each, the daily dosage of 300 mg can be divided into three equal doses of 100 mg, which is perfect for the available capsule size. Therefore, the patient will need one capsule per dose to make up the total daily dosage of 0.3 g.
To determine the number of capsules needed per dose, we first need to convert the dosage from grams to milligrams. Since 1 gram is equal to 1000 milligrams, 0.3 grams is equal to 300 milligrams. Next, we divide the dosage by the amount of phenytoin in each capsule. Each capsule contains 100 mg of phenytoin, so we divide 300 mg by 100 mg/capsule to get the number of capsules needed per dose. In this case, 3 capsules will be administered per dose.