Dilaudid is prescribed to treat moderate to severe pain. Dilaudid 2 mg is the smallest dose of it. This medicine has two other doses namely Dilaudid 4 mg and Dilaudid 8 mg. The generic name of this is hydromorphone hydrochloride. Hydromorphone belongs to opioid analgesics. This can be addictive if used for a long period of time. After taking it the patient should not take the vehicle anywhere.