What factors influence manufacturers' choices of dosage forms?

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Most factors that determine the dosage form of a medication are the pharmacokinetic properties of a medication. For example, heparin (an anticoagulant) is available only in parenteral (intravenous [IV] or subcutaneous [SubQ]) form because it becomes ineffective when taken orally as a result of its interaction with stomach acids. Manufacturers prepare certain medications with the ability to release the active ingredient over an extended period. Another consideration is given to the person taking the drug, which includes the patient's age and condition.

What Factors Influence Manufacturers' Choices of Dosage Forms