Which medicines can cause immediate precipitation or turbidity when mixed at certain concentrations in a syringe with Methotrexate 25 mg/ml Injection, the Hospira UK Ltd product?

Droperidol, heparin sodium, metoclopramide hydrochloride and ranitidine hydrochloride cause immediate precipitation or turbidity when combined at certain concentrations in a syringe with Methotrexate 25 mg/ml Injection, the Hospira UK Ltd product.