Abbreviation: DIAM
Two proposed mechanisms
Direct meningeal irritation by intrathecal<unk> 
Hypersensitivity reaction to<unk>  (type III and IV)
Higher predominance in SLE and female gender
Direct meningeal irritation by intrathecal<unk> 
Hypersensitivity reaction to<unk>  (type III and IV)
NSAIDs
Most common cause
Antibiotics
Sulfamethizole
TMP-SMX
Isoniazid
Ciprofloxacin
Amoxicillin
Gentamicin
Penicillin
Metronidazole
Cephalosporins
Pyrazinamide
Immunoregulating agents
IVIGs
OKT3 monoclonal antibodies
Misc
Sulfasalazine
Carbamazepine
Azathioprine
Indinavir
Valacyclovir
Ranitidine
Famotidine
Methylprednisolone acetate
Allopurinol
Most common cause
Sulfamethizole
TMP-SMX
Isoniazid
Ciprofloxacin
Amoxicillin
Gentamicin
Penicillin
Metronidazole
Cephalosporins
Pyrazinamide
IVIGs
OKT3 monoclonal antibodies
Sulfasalazine
Carbamazepine
Azathioprine
Indinavir
Valacyclovir
Ranitidine
Famotidine
Methylprednisolone acetate
Allopurinol
Drug induced aseptic meningitis
Migraine headache
Neoplastic meningitis
Tension headache
Primary Amebic Meningoencephalitis
Cluster headache
Limbic encephalitis
Meningitis/encephalitis