Study Protocol: Impact of Metamizole (Optalgin®) on Anti-Xa Concentrations in Oncology Patients Receiving DOACs
Trial statusRecruiting
Trial phaseNot applicable
Trial typeInterventional
Biological sexAll
Age18+
SponsorRambam Health Care Campus
Evaluation of the Effect of metamizole (Optalgin®) on Anti-Xa Levels in Oncology Patients Receiving Direct Oral Anticoagulants (DOACs)
Adult oncology patients (≥18 years old).
Receiving apixaban or rivaroxaban for anticoagulation.
New/current metamizole users taking at least 1g TID for pain management.
Platelets ≥100×10⁹/L
History of allergic reaction to metamizole or DOACs.
Individuals with significant gastrointestinal disorders that may affect absorption, including (but not limited to) diagnosed bowel obstruction, persistent diarrhea, or the presence of a nasogastric tube (NGT/zonda)