Cluster Headache: Transitional Therapy
Transitional (bridge) therapy aims to suppress cluster attacks rapidly while waiting for preventive medications to reach therapeutic effect. Verapamil, the mainstay preventive, takes 2-3 weeks to titrate to an effective dose. During this window, transitional therapy breaks the attack cycle. The three main options are a short corticosteroid course, greater occipital nerve (GON) block, and suboccipital steroid injection.
Bottom Line
- Prednisone taper: Most commonly used bridge. Rapidly effective within 1-2 days. Typical course: 60-80 mg/day for 5 days then taper over 2-3 weeks.
- GON block with steroid: Level A evidence (Ambrosini 2005). Single injection of local anesthetic + corticosteroid; reduces attacks for 2-4 weeks.
- DHE IV protocol: Repetitive IV DHE over 3-5 days. Used in inpatient or infusion center setting for severe bouts.
- Purpose: Suppress attacks during the 2-3 week window while verapamil or lithium is titrated to effective dose
- Limit corticosteroid courses to 1-2 per year to avoid cumulative steroid side effects (especially in patients with frequent episodic bouts)
Corticosteroids
| Regimen | Protocol | Evidence | Notes |
|---|---|---|---|
| Prednisone taper | 60-80 mg/day × 5 days, then taper by 10 mg every 2-3 days over 2-3 weeks | Level C (limited RCT data, but widely used with strong clinical consensus). Couch & Ziegler (1978), small positive trial. | Most commonly used transitional. Rapid onset (1-2 days). Attacks may rebound as taper completes if preventive is not yet effective. |
| Dexamethasone | 4-8 mg IV/IM daily × 3-5 days | Limited evidence; extrapolated from prednisone data | Alternative for patients who cannot take oral; longer half-life allows less frequent dosing |
| Methylprednisolone IV | 500 mg IV daily × 3-5 days | Case series only. Used for very severe bouts refractory to oral steroids. | Inpatient or infusion center. Monitor glucose, blood pressure. |
Steroid Bridge: Practical Protocol
- Start verapamil simultaneously with the steroid taper. By the time the taper finishes, verapamil should be at a therapeutic dose.
- Typical timeline:
- Day 1: Start prednisone 60-80 mg + verapamil 80 mg TID
- Days 2-5: Prednisone 60-80 mg; titrate verapamil toward 240-360 mg/day
- Days 6-20: Taper prednisone by 10 mg every 2-3 days; continue verapamil titration to 480-720 mg/day (with ECG monitoring)
- Day 21+: Off prednisone; verapamil at target dose maintaining suppression
- Rebound risk: If the steroid taper is too fast or the preventive dose is not yet adequate, attacks will return. Slower taper (≥18-21 days total) reduces rebound.
- Limit: No more than 2 steroid courses per year. If bouts are frequent, prioritize non-steroid bridges (GON block, DHE).
Steroid Side Effects and Cautions
- Short-term: Insomnia (very common — take in the morning), appetite increase, mood changes (irritability, euphoria, rarely psychosis), GI upset, hyperglycemia
- Repeated courses: AVN (avascular necrosis), adrenal suppression, bone loss, weight gain
- Diabetes: Monitor glucose; may need short-term insulin adjustment
- GI protection: Consider PPI co-prescription if history of peptic ulcer disease or concurrent NSAID use
Greater Occipital Nerve Block
The GON block with corticosteroid is an evidence-based transitional therapy with the advantage of avoiding systemic steroid exposure.
Evidence
- Ambrosini et al. (2005): RCT of suboccipital steroid injection (betamethasone + lidocaine) vs placebo in episodic cluster headache. Significant reduction in attacks in the steroid group by week 1, lasting up to 4 weeks.
- Leroux et al. (2011): Suboccipital cortivazol injection vs placebo in episodic cluster. Attack-free by day 3 in 57% vs 12% (p=0.005).
- AHS Level A evidence for GON block in cluster headache transitional therapy
Technique
- Injection: 2-3 mL bupivacaine 0.5% + methylprednisolone 40 mg (or betamethasone 6 mg, or triamcinolone 40 mg) at the GON site ipsilateral to the cluster side
- Inject at the standard GON landmark (one-third distance from inion to mastoid, medial to palpable occipital artery)
- Some practitioners inject bilaterally; ipsilateral-only is supported by the evidence
- Can repeat once at 4 weeks if needed; limit steroid-containing injections to every 3 months per site
GON Block vs Steroid Taper: When to Choose Which
- GON block preferred: Patient has already had a steroid course this year, diabetes (avoids systemic hyperglycemia), steroid-intolerant, or preference for a localized approach
- Steroid taper preferred: GON block unavailable (no clinic access or unfamiliar with technique), very severe bout needing immediate systemic effect, patient preference
- Both can be combined for severe bouts: GON block for rapid local effect + low-dose steroid taper for systemic coverage
IV Dihydroergotamine (DHE) Protocol
Repetitive IV DHE is used for severe cluster bouts, often as an inpatient or in an infusion center. It can break the attack cycle and provide a bridge lasting days to weeks.
- Protocol: DHE 0.5-1 mg IV every 8 hours for 3-5 days (Raskin protocol or modified version). Pre-treat with metoclopramide 10 mg IV to prevent nausea.
- Efficacy: Case series show >80% of patients have significant reduction or cessation of attacks during and after the infusion course
- Duration of effect: Variable; may suppress attacks for days to weeks, providing a bridge while preventive medications take effect
- Monitoring: Cardiac monitoring (ECG), blood pressure. Contraindicated in uncontrolled hypertension, CAD, PVD, pregnancy.
- Cannot combine with triptans — must wait ≥24 hours between triptan and DHE use
Other Transitional Options
| Agent | Details | Notes |
|---|---|---|
| Frovatriptan scheduled | 2.5 mg BID for the duration of the bout (short-term) | Off-label. Some practitioners use a long-acting triptan on a scheduled basis as a bridge. Limited evidence; risk of rebound. |
| Ergotamine tartrate | 1-2 mg at bedtime | Historical use for nocturnal cluster attacks. Prevents the predictable nighttime attack. Rarely used now due to side effects and availability. |
| SPG block (intranasal) | Bupivacaine 0.5% via catheter or applicator to sphenopalatine fossa | Can provide short-term relief. Repeat 2-3 times/week during bout. Less evidence than GON block for cluster. |
| gammaCore (nVNS) | Two 2-minute stimulations 2-3 times daily as adjunctive prevention | FDA-cleared for cluster. ACT2 study: modest preventive effect. More useful as adjunct than standalone bridge. |
Transitional Therapy Algorithm
When a Cluster Bout Begins
- Start preventive immediately: Verapamil 80 mg TID (or restart prior effective preventive)
- Start transitional simultaneously:
- Option A: Prednisone 60-80 mg × 5 days then taper over 2-3 weeks
- Option B: GON block with steroid (ipsilateral)
- Option C: Both (severe bouts)
- Provide acute treatment: Prescribe home oxygen + sumatriptan SC
- Titrate preventive during the bridge period (verapamil to 480-720 mg/day with ECG)
- Taper transitional once preventive is at target dose and attacks are suppressed
References
- Ambrosini A, et al. Suboccipital injection with a mixture of rapid- and long-acting steroids in cluster headache: a double-blind placebo-controlled study. Pain. 2005;118(1-2):92-96.
- Leroux E, et al. Suboccipital steroid injections for transitional treatment of patients with cluster headache: randomised, double-blind, placebo-controlled trial. Cephalalgia. 2011;31(12):1320-1328.
- Robbins MS, et al. Treatment of cluster headache: the American Headache Society evidence-based guidelines. Headache. 2016;56(7):1093-1106.
- Nagy AJ, et al. Repetitive intravenous dihydroergotamine for the treatment of refractory cluster headache. Headache. 2007;47(1):19-27.
- May A, et al. EFNS guidelines on the treatment of cluster headache and other trigeminal-autonomic cephalalgias. Eur J Neurol. 2006;13(10):1066-1077.