Vitamin B6, B9 & B12 Levodopa
MajorVitamin B6, B9 & B12 should not be given to people taking levodopa, because the pyridoxine hydrochloride in it works against levodopa and stops it doing its job. The exception is a medicine that contains both carbidopa and levodopa, where pyridoxine hydrochloride can be used at the same time.
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.