Table 2.

Partial list of the more prominent causes of transient neutropenia

Drugs
Anticonvulsant	Carbamazepine, valproate
Antimicrobial	Sulfonamides, penicillins, trimethoprim/sulfamethoxazole
Antipsychotic	Clozapine, olanzapine, phenothiazines
Antirheumatic	Gold, levamisole, penicillamine
Antithyroid	Methimazole, propylthiouracil
Other	Aminopyrine, deferiprone, rituximab, levamisole (adulterated cocaine)
Infections
Viral	CMV, EBV, HIV, influenza, parvovirus B19
Bacterial	Overwhelming sepsis (any organism), Anaplasma, Brucella, Ehrlichia, paratyphoid, Mycobacterium tuberculosis, tularemia, typhoid
Protozoan	Plasmodium sp.
Antibody
Neonatal isoimmune

CMV, Cytomegalovirus; EBV, Epstein-Barr virus; HIV, human immunodeficiency virus.