Which migraine medication comes in an injection form only?

Botox type A is a medication that is specifically approved for the treatment of chronic migraine through injection. It works by blocking certain chemical signals from nerves, effectively reducing the frequency of migraines in patients who suffer from chronic episodes. The injection is generally administered by a healthcare professional and involves multiple sites on the head and neck. This method is distinct as the other medications listed can be administered in various forms, including oral tablets, but are not exclusively available as injections.

Sumatriptan, for example, is available in both injectable and oral forms, while Rizatriptan and Topiramate are typically available only as oral medications. Therefore, Botox type A’s exclusive form as an injection clearly identifies it as the correct answer to the question regarding which migraine medication is solely in injection form.