Nifedipine tablets cost$5-8 a bottle. Nifedipine is a calcium channel blocker that can treat dizziness and headache caused by hypertension and chest tightness and tingling in the precordial region caused by coronary artery disease. Hypertension is caused by vasoconstriction, nifedipine has the effect of vasodilatation, vasodilatation after the lumen inner diameter increases, the pressure of blood on the blood vessels then decreases, due to the thickening of the lumen will lead to increased blood supply to the heart, relieve chest tightness or precordial pain, do not start with too large a dose, otherwise it will cause low blood pressure and aggravate dizziness. The drug has few adverse reactions, the first dose will appear dizziness symptoms, related to physical sensitivity, you can reduce the dose and continue to take, to be adapted to the body and then gradually increase to the therapeutic dose, after taking the drug nausea, vomiting symptoms, change to take after meals can be reduced.