Which medications are associated with drug‑induced fever?

Drug-Induced Fever: Common Causative Medications

Any drug can cause fever through hypersensitivity reactions, but antibiotics—particularly beta-lactams—are the most frequent culprits, with penicillins, cephalosporins, and rifampicin leading the list.

Most Common Drug Classes That Cause Fever

Antibiotics (Most Frequent Overall)

Beta-lactam antibiotics are the predominant cause of drug-induced fever 1, 2:

• Penicillins: Most common cause of drug-induced anaphylaxis and fever 3

  • Piperacillin: 17% incidence of drug fever 2
  • Oxacillin: Significantly associated (PRR 9.1) 1
  • Ampicillin: Lower incidence (3%) 2

• Cephalosporins: Second most common beta-lactam class 1, 2

  • Cefotaxime: 15% incidence, PRR 5.5 1, 2
  • Ceftriaxone: PRR 5.4 1
  • Ceftizoxime: 14% incidence 2
  • Cefoperazone: 8% incidence 2
  • Cefazolin: 0% incidence (notably lower) 2

• Aminoglycosides:

  • Amikacin: Highest PRR of 39.6 among all antibiotics 1

• Fluoroquinolones:

  • Ciprofloxacin: PRR 3.1 1, with documented case reports 4

• Anti-tuberculosis drugs 5:

  • Rifampicin: Most common TB drug causing fever (PRR 4.0) 1
  • Para-aminosalicylic acid: Second most common 5
  • Pyrazinamide: Third most common 5
  • Isoniazid: PRR 3.9 1

• Other antibiotics:

  • Vancomycin: PRR 4.0 1
  • Cotrimoxazole (trimethoprim-sulfamethoxazole): PRR 2.6 1, 6
  • Pristinamycin: PRR 3.1 1
  • Linezolid: Can exacerbate serotonin syndrome 7

Non-Antibiotic Medications

NSAIDs and Aspirin: Second most common cause of drug-induced anaphylactic reactions 3

Antipsychotic/Neuroleptic Medications (cause neuroleptic malignant syndrome with fever) 7:

• Haloperidol: Most frequently reported in ICU settings 7
• Phenothiazines
• Thioxanthenes
• Butyrophenones

Serotonin Reuptake Inhibitors: Cause serotonin syndrome with fever 7

Anesthetic Agents (cause malignant hyperthermia) 7:

• Succinylcholine
• Halothane (most frequently identified inhalation anesthetic)

Cardiovascular Drugs 8:

• Quinidine
• Procainamide
• Methyldopa

Anticonvulsants 8:

• Phenytoin

Post-surgical medications 9:

• Propofol
• Morphine

Clinical Features and Timing

Typical presentation 7:

• Onset timing: Mean 21 days (median 8 days) after drug initiation 7
  • Most commonly occurs within 1-3 weeks 5
  • Can occur within 2 days (median) 1
• Fever pattern: Low-grade initially, progressing to high remittent fever (often >39°C) 5, 2
• Resolution: 1-7 days after drug discontinuation (typically 1-3 days) 7

Associated features (often ABSENT, making diagnosis challenging):

• Rash: Occurs in only a small fraction of cases 7
• Eosinophilia: Uncommon 7
• Other symptoms: Chills, headache, nausea, vomiting, joint pain 5
• Laboratory findings: Transient LDH elevation (51%), mild neutropenia (23%), thrombocytopenia (8%) 2

Critical Diagnostic Pitfall

The absence of rash and eosinophilia does NOT exclude drug fever 7. Diagnosis relies primarily on temporal relationship between drug administration and fever onset/resolution, not on classic "allergic" features.

Drug Withdrawal Syndromes (Also Cause Fever)

Withdrawal from these substances causes fever with tachycardia, diaphoresis, and hyperreflexia 7:

• Alcohol
• Opiates (including methadone)
• Barbiturates
• Benzodiazepines

Mechanism Considerations

Newer beta-lactam derivatives (piperacillin, third-generation cephalosporins) have higher incidence of drug fever than older agents (ampicillin, cefazolin), suggesting the side chains attached to the core beta-lactam structure are involved in the mechanism 2.

Drug fever is most commonly a hypersensitivity reaction, not related to the drug's primary pharmacological action 8. It typically requires prior sensitization, though the lag time varies considerably 7, 1.