Overview
Leukopenia refers to a decrease in the number of white blood cells, particularly neutrophils, which can increase susceptibility to infections. It can be drug-induced, spurious due to laboratory errors, or associated with underlying medical conditions 123.Diagnosis
Clinical Presentation: Symptoms may include recurrent infections, fever, and malaise 13.
Laboratory Tests: Complete blood count (CBC) showing low absolute neutrophil count (ANC) 12.
Differential Diagnosis: Rule out spurious leukopenia caused by in vitro granulocyte aggregation 2.
Evaluation for Drug-Induced Causes: Consider recent medication exposure, especially clindamycin, phenelzine, and other MAOIs 13.Management
Discontinue Suspect Medications: Stop clindamycin or phenelzine if suspected as the cause 13.
Supportive Care: Monitor for and manage infections, provide prophylactic antibiotics if necessary 1.
Close Monitoring: Regular CBC to track recovery of neutrophil counts 1.Special Populations
Elderly: Increased susceptibility to drug-induced leukopenia; careful monitoring of medication effects 1.
Comorbidities: Patients with chronic conditions like chronic myelogenous leukemia may be more vulnerable 1.Key Recommendations
Be Alert to Clindamycin-Induced Neutropenia: Clinicians should recognize clindamycin as a potential cause of drug-induced neutropenia, especially in elderly patients 1 (Evidence: Weak).
Investigate Spurious Leukopenia: Consider in vitro granulocyte aggregation as a cause of spurious leukopenia results 2 (Evidence: Weak).
Monitor and Manage Side Effects of MAOIs: Regularly assess white blood cell counts in patients on phenelzine or other MAOIs for signs of leukopenia 3 (Evidence: Weak).References
1 Bubalo JS, Blasdel CS, Bearden DT. Neutropenia after single-dose clindamycin for dental prophylaxis. Pharmacotherapy 2003. link
2 Epstein HD, Kruskall MS. Spurious leukopenia due to in vitro granulocyte aggregation. American journal of clinical pathology 1988. link
3 Tipermas A, Gilman HE, Russakoff LM. A case report of leukopenia associated with phenelzine. The American journal of psychiatry 1984. link