<prompt> Rx of latent syphilis-PenicillinErythromycinTetracyclineCiprofloxacin  <response>: Stage of Syphilis Patients without Penicillin Allergy Patients with Confirmed Penicillin Allergy Primary, secondary, or early latent CSF normal or not examined: Penicillin G benzathinesingle dose of 2.4 mU IMCSF abnormal: Treat as neurosyphilis CSF normal or not examined: Tetracycline HCl500 mg PO qid or doxycycline 100 mg PO bidfor 2 weeksCSF abnormal: Treat as neurosyphilis Late latent or latent of unceainduration, cardiovascular, or benignteiary CSF normal or not examined: Penicillin G benzathine2.4 mU IM weekly for 3 weeksCSF abnormal: Treat as neurosyphilis CSF normal and patient not infected with HIV:Tetracycline HCl 500 mg PO qid or doxycycline100 mg PO bid for 4 weeksCSF normal and patient infected with HIV:Desensitization and treatment with penicillin if compliancecannot be ensuredCSF abnormal: Treat as neurosyphilis Harrisons Principles of internal medicine, 20 th edition, page 1387 