How much dose of a amlodipine is used to lower bp in hypertensive urgency
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Here is a complete, evidence-based answer:
Amlodipine in Hypertensive Urgency
Important context first
Amlodipine is NOT the preferred first-line agent for hypertensive urgency. It has a slow onset of action (peak effect in 6-12 hours), which limits its usefulness when you need BP reduced over 2-4 hours. Preferred agents are captopril, labetalol, or clonidine because they act faster.
That said, amlodipine has been studied in hypertensive urgency and can be used when faster-acting agents are unavailable or when starting/reinstituting long-term therapy is the goal.
Dose of Amlodipine Used in Hypertensive Urgency
| Setting | Dose | Route | Notes |
|---|---|---|---|
| Adults | 5 mg orally (single dose) | PO | Most studied dose in HU trials |
| Adults (some protocols) | 10 mg orally | PO | Used in some retrospective studies |
| Chronic hypertension (standard) | 5-10 mg once daily | PO | Starting dose 2.5-5 mg, max 10 mg/day |
- In a randomized trial (Grassi et al., cited in Comprehensive Clinical Nephrology, 7th Edition), patients who did not respond to 30 minutes of rest were given a single oral dose of amlodipine 5 mg and BP was reassessed at 60 and 120 minutes.
- A retrospective cohort study used both 5 mg and 10 mg PO doses (per the systematic review published in J Gen Intern Med, 2018).
How it compares to other oral agents in HU
Per Comprehensive Clinical Nephrology, 7th Edition:
"The choice of drugs for treatment of hypertensive urgencies is much broader than for emergencies because almost all antihypertensives lower BP effectively given sufficient time. Captopril, clonidine, labetalol, and other short-acting drugs have been used most often."
Typical oral regimens:
- Captopril: 12.5-25 mg PO (fastest-acting oral agent, onset ~15-30 min)
- Labetalol: 200 mg PO (onset 1-2 h)
- Clonidine: 0.1-0.2 mg PO (onset 30-60 min)
- Amlodipine: 5 mg PO (onset delayed, but useful for initiating long-term therapy)
Bottom line
- Amlodipine 5 mg orally is the dose used in studies for hypertensive urgency.
- It is appropriate when the clinical goal is to initiate or resume long-term antihypertensive therapy rather than achieve rapid BP reduction.
- It should not be used when a faster response is needed (e.g., BP must come down within 1-2 hours).
- Short-acting nifedipine capsules (sublingual/bite-and-swallow) were historically used for rapid effect but are now discouraged due to risk of precipitous BP drops - Goldman-Cecil Medicine notes this explicitly.
- Amlodipine should never be used in hypertensive emergency (where IV agents are mandatory).
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