Nifedipine 20 mg dosage for adults?

Dosing with nifedipine depends on the formulation (immediate-release IR vs extended-release ER) and the condition being treated (high blood pressure, angina, or Raynaud’s).

If you have a 20 mg tablet, that strength can be used in different ways:
- Immediate-release (IR) nifedipine: 10 mg or 20 mg by mouth every 4–6 hours as needed for angina. Typical total daily dose is up to about 80 mg/day (your doctor may adjust within that range). Do not take more than prescribed.
- Extended-release (ER/XL) nifedipine: common starting doses are 30 mg once daily, with possible increases by 30 mg every 2–4 weeks. Typical daily range is 30–90 mg (some products allow up to 120 mg/day). A 20 mg ER dose is not common for most brands.

Important notes:
- Do not switch between IR and ER products without your clinician’s guidance.
- Do not crush or chew ER tablets; swallow whole.
- Avoid grapefruit juice with many nifedipine products.
- Dosing must be individualized; your indication, other medications, and health conditions matter.

If you can share:
- Which product/formulation you’re using (IR vs ER, brand name if any)
- The condition being treated (hypertension, angina, Raynaud’s)
- Any other medications you’re taking

I can give more specific guidance. And if you’re currently prescribed 20 mg and have concerns, contact your prescriber—don’t adjust the dose yourself. If you notice severe dizziness, fainting, rapid/slow heartbeat, swelling, or chest pain, seek medical help.