G-Vitamin B6 Pyridoxine Hydrochloride Vitamin B6, B9 & B12
MajorThe leaflet text here is about pyridoxine hydrochloride and levodopa, not about Vitamin B6, B9 & B12 together with pyridoxine hydrochloride. It says nothing on how those two medicines act when taken together, so there is no interaction between this pair that I can state without inventing one. What the text does say is this: pyridoxine hydrochloride should not be given to patients receiving levodopa, because it works against levodopa's action. It can be used alongside a preparation that contains both carbidopa and levodopa.
These medicines can affect each other in a serious way. Do not start taking them together unless your doctor has said it is OK. If you already take both, do not stop either one on your own: speak to your doctor or pharmacist soon.