Final answer:
The dosage form that is usually rubbed in with friction is an ointment.
Step-by-step explanation:
The dosage form that is usually rubbed in with friction is an ointment. Ointments are semi-solid preparations that are applied to the skin and require friction to be spread evenly. Examples of ointments include corticosteroid ointments for skin inflammation and antibiotic ointments for wound healing.