Treatment Options for Neurosyphilis in Patients Allergic to Penicillin and Ceftriaxone

First-Line Treatment and Allergic Considerations

The Centers for Disease Control and Prevention recommends penicillin G as the gold standard treatment for neurosyphilis, with a dosage of 18-24 million units per day IV for 10-14 days, but it cannot be used in penicillin-allergic patients 3, 2
Ceftriaxone is typically the first alternative for penicillin-allergic patients, with a dosage of 2g daily IM or IV for 10-14 days, but cross-reactivity between penicillin and ceftriaxone allergies can occur 1, 4

The Centers for Disease Control and Prevention recommends doxycycline 100 mg orally twice daily for 28 days as the alternative regimen for patients allergic to both penicillin and ceftriaxone 1, 2

All patients with neurosyphilis should be managed in consultation with an infectious disease specialist, and CSF examination should be performed before initiating therapy to establish baseline parameters 1, 6, 2
Follow-up CSF examination should be repeated every 6 months until the cell count normalizes, and the CSF leukocyte count is the most sensitive measure of treatment effectiveness 6, 7

The Centers for Disease Control and Prevention recommends that all persons with syphilis should be tested for HIV, and patients with syphilitic eye disease should be managed in collaboration with an ophthalmologist 6, 8, 2

Quantitative nontreponemal serologic tests should be repeated at 6, 12, and 24 months, and treatment failure should be suspected if titers increase fourfold, high titers fail to decline, or new symptoms develop 1, 9, 6