Final answer:
Propranolol (Inderal) is the medication among the options given that is used to prevent migraines. It's a beta-blocker that can reduce both the frequency and severity of migraine episodes.
Step-by-step explanation:
The type of medication that can be used to prevent migraines is Propranolol (Inderal). Propranolol is a beta-blocker that can reduce the frequency and severity of migraines. It is considered a preventive medication rather than an acute treatment. Other options like Lamotrigine may have some preventive effects for certain types of headaches, but propranolol is specifically indicated for migraine prevention. Meds like Metoclopramide are more often used to relieve nausea associated with migraines, and Sumatriptan is a type of medication known as a triptan, which is designed for the acute treatment of migraine symptoms, not prevention.