There is no such thing as how long does nifedipine extended-release tablets work when taken by mouth; this medication is taken orally. There is no authoritative information on how long nifedipine extended-release tablets are effective when taken orally, usually 15 to 30 minutes, the exact time varies from person to person. Nifedipine extended-release tablets belong to the dihydropyridine calcium channel blockers, because this drug is oral medication, so there is no such thing as nifedipine extended-release tablets containing how long it takes to be effective. Secondly, at present, there is no relevant authoritative information specifying how long nifedipine extended-release tablets are effective when taken orally, which is still unclear. Investigation shows that in general, the patient oral nifedipine extended-release tablets can take effect in about 15 to 30 minutes, however, because each person’s condition, physical state and sensitivity to drugs and other factors are different, so the specific time of the drug’s effect, there is a clear individual variability, can not be generalized. To summarize, patients must take the correct way to use nifedipine extended-release tablets under the guidance of the doctor, do not self-medication, so as not to delay the condition.