Medication can be compounded into customized capsules, especially in cases where an alternate strength is required or to omit potential allergens or irritants, such as dyes, preservatives, or gluten. To lessen the number of doses to be taken, multiple medications often can be combined into a single dosage or made into sustained-release capsules. Vegetarian capsules made from cellulose are available for patients who do not want to take a gelatin capsule.