Cautions with other medicines
Hydroxocobalamin is usually safe to have with other medicines, including painkillers.
Mixing hydroxocobalamin with herbal remedies and supplements
There's not enough information to say that complementary medicines, herbal remedies and supplements are safe to take with hydroxocobalamin. They're not tested in the same way as pharmacy and prescription medicines. They're generally not tested for the effect they have on other medicines.
Important: Medicine safety
Tell your doctor or pharmacist if you're taking any other medicines, including herbal remedies, vitamins or supplements.