Nifedipine is a calcium channel blocker commonly used to lower blood pressure in individuals with hypertension (high blood pressure). The onset of action of nifedipine can vary depending on the formulation and dose.
Immediate-release nifedipine typically starts to lower blood pressure within 15 to 30 minutes after ingestion, and its effects can last for about 4 to 6 hours. However, immediate-release formulations of nifedipine have been associated with potential risks and are no longer recommended for the treatment of hypertension due to their rapid and unpredictable effects on blood pressure, which can lead to dangerous fluctuations.
Extended-release formulations of nifedipine, on the other hand, have a slower onset of action and are designed to provide a more stable and controlled decrease in blood pressure over a longer period. The onset of action for extended-release nifedipine can be around 1 to 2 hours, and the effects can last for 24 hours, depending on the specific brand and dosage.
It's essential to take nifedipine as prescribed by a healthcare professional and not to adjust the dosage or stop taking it without consulting a doctor. High blood pressure management typically involves a comprehensive approach, including lifestyle changes and possibly other medications, so always follow your doctor's recommendations for the best outcome.