Propranolol Dosing for Central (Neurogenic) Fever in Adults
For adult patients with central fever, initiate propranolol at 20-30 mg orally every 6 hours (total daily dose 80-120 mg/day), with dose titration based on temperature response over 48 hours.
Dosing Regimen
The evidence for propranolol in central fever comes exclusively from case reports and case series in traumatic brain injury (TBI) and stroke patients, as no guidelines specifically address this indication. Start with propranolol 20-30 mg orally every 6 hours 1. This translates to approximately 80-120 mg total daily dose divided into 4 doses.
Dose Titration Strategy
- Initial response assessment: Expect temperature reduction of at least 1.5°C within 48 hours of starting therapy 1
- If inadequate response: May increase dose incrementally, though specific escalation protocols are not established in the literature
- Duration: Continue propranolol until all signs of autonomic dysfunction resolve (tachycardia, profuse sweating, abnormal posturing) 1
Critical Monitoring Points
Before initiating therapy, confirm:
- Negative infectious workup (cultures, imaging, inflammatory markers)
- Presence of autonomic dysfunction features: tachycardia, profuse sweating, hypertension, abnormal posturing
- Hypothalamic injury on neuroimaging (intraventricular hemorrhage, pontine hemorrhage, or diffuse injury) 1, 2
During treatment, monitor:
- Heart rate and blood pressure (propranolol causes bradycardia and hypotension as expected pharmacologic effects)
- Temperature every 4-6 hours initially
- Signs of bronchospasm in patients with reactive airway disease
Evidence Quality and Clinical Context
The evidence base is extremely limited, consisting only of case reports 1, 3, 4, 2, 5. The 1994 case series by Boeve et al. 1 remains the foundational reference, describing three severe TBI patients with Glasgow Coma Scale scores of 3-4 who developed central fevers (38.9-40.6°C) refractory to conventional management. All responded to propranolol 20-30 mg every 6 hours, with fever recurrence upon attempted weaning.
More recent case reports 4, 2, 5 support similar dosing strategies, with some combining propranolol with baclofen for enhanced effect. The 2023 systematic review 3 acknowledges significant heterogeneity in dosing strategies and treatment duration across published cases.
Mechanism and Rationale
Central fever results from impaired cortical inhibition of the hypothalamus following brain injury, causing dysregulated sympathetic activation 5. Propranolol, as a lipophilic nonselective beta-blocker, crosses the blood-brain barrier and may modulate central thermoregulatory pathways while simultaneously addressing peripheral manifestations of autonomic hyperactivity 5.
Important Caveats
Contraindications to consider:
- Decompensated heart failure
- Second- or third-degree heart block
- Severe bradycardia (HR <50 bpm)
- Reactive airway disease or COPD (relative contraindication)
- Hypotension requiring vasopressor support
Weaning considerations: The case series demonstrates that premature discontinuation results in fever recurrence within 3 days 1. When autonomic dysfunction resolves, taper gradually over several days to weeks rather than abrupt cessation.
Alternative agents: If propranolol is contraindicated or ineffective, case reports support baclofen (10-20 mg three times daily) or bromocriptine (2.5-5 mg twice daily) as alternatives 3, 4, though evidence is even more limited.
Practical Algorithm
- Confirm diagnosis: Fever >38.3°C + negative infectious workup + autonomic dysfunction + hypothalamic injury on imaging
- Initiate propranolol: 20-30 mg PO every 6 hours (or 0.3-0.5 mg/kg/dose if using weight-based dosing)
- Assess at 48 hours: Temperature should decrease ≥1.5°C
- If inadequate response: Consider increasing dose or adding baclofen
- Continue until: Autonomic dysfunction resolves (may require weeks to months)
- Taper gradually: Reduce by 25% every 3-7 days while monitoring for fever recurrence
The FDA-approved dosing for other indications 6 ranges from 80-640 mg/day, providing a safety margin for the doses used in central fever management. However, this is an off-label use with no formal dosing guidelines, requiring individualized clinical judgment based on patient response and tolerance.