Hydroxyzine (Vistaril) is an underutilized old anti-histamine drug with some unique properties. Just like diphenhydramine (Benadryl) and other older anti-histamine drugs, hydroxyzine causes some sedation. However, it is the only anti-histamine that is officially approved for “anxiety and tension”. It is also approved for itching due to allergic conditions. Off-label (i.e. without FDA-approval) it is used to treat motion sickness, nausea, vomiting, and dizziness.

Hydroxyzine is often used as and adjuvant analgesic, that is as an add-on drug that makes pain medications work better.

A study comparing injections of hydroxyzine, 50 mg with a pain medication nalbuphine 10 mg, with a combination of hydroxyzine and nalbuphine, and with placebo found no benefit from adding hydroxyzine when treating migraines.

A study comparing an injection of hydroxyzine 50 mg plus meperidine (Demerol, a narcotic pain killer), 100 mg was similar to an injection of ketorolac (Toradol) 60 mg in its relief of an acute migraine. Nausea and drowsiness were similar in two groups.

Another study compared hydroxyzine 75 mg intravenously plus meperidine 75 mg intramuscularly to DHE 1 mg IV plus metoclopramide (Reglan) 10 mg IV. Pain reduction was greater with DHE/metoclopramide.

There have been no studies examining the efficacy of hydroxyzine alone, whether as an intravenous or intramuscular injection or as a tablet. It is likely that it will remain an adjuvant or add-on medication for the treatment of migraine headaches.

I sometimes prescribe it to be taken daily to patients whose allergies worsen their migraine headaches or even when there is only a suspicion of an allergic component. It is also useful when anxiety is a contributing factor, which is not unusual since those suffering from migraines are 2-3 times more likely to also have anxiety. For many patients it is too sedating to be taken during the day, unless they are treating an acute attack. Most people take 25 or 50 mg nightly, although some tolerate and benefit from 25 mg taken three times a day.

Hydrocodone (Vicodin, Lortab, Norco) is an opioid or narcotic pain killer, which should not have much of a role to play in the treatment of migraine headaches. Opioids are much less effective for the treatment of migraines than any other pain syndrome. They often make nausea worse, make patients sedated, and do not provide good pain relief.

Unfortunately, according to a study published in Headache, half of the patients presenting to an emergency room with a migraine headache are prescribed an opioid drug such as hydrocodone. Patients with migraines who are given an opioid injection stay in an ER longer than if they don’t get an opioid.
Opioids are not only ineffective, but if used more than once a week can also worsen headaches by causing medication overuse headache and cause addiction. Regular intake of opioids can also worsen other pain conditions, such as neck and back pain, by causing hyperalgesia, an increased sensitivity to pain.

Patients presenting to an ER with a migraine should be given and injection of sumatriptan (Imitrex) or a non-steroidal anti-inflammatory drug (NSAID), ketorolac (Toradol). Neither triptans nor NSAIDs are likely to cause rebound or medication overuse headache.

There are exceptions when occasional use of opioids is appropriate. Perhaps a fraction of one percent or one out of several hundred patients may respond only to an opioid analgesic and nothing else or some patients have to take an opioid if they have contraindications for the use of NSAIDs and triptans. Some patients do well on long-term opioid maintenance, but the number of such patients in our practice is also exceptionally low.