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Hydralazine relaxes the muscles that control the diameter of blood vessels.
This may lead to vitamin B6 deficiency. 3 People with questions should ask their prescribing doctor or pharmacist. Alcohol Alcohol causes blood vessels to dilate, lowering blood pressure. This action may add to the blood pressure-lowering effect of hydralazine and increase the risk of dizziness, fainting, or accidental falls. People taking hydralazine should avoid alcohol and should read all product labels carefully for alcohol content.