Norvasc Amlodipine Treatment Decisions: Dosing, Tolerability, and Combination Strategies

Amlodipine is one of the more straightforward antihypertensives to prescribe and titrate because of its long half-life, simple once-daily dosing, and well-characterized dose-response relationship. Understanding how prescribers select and adjust doses, and what the main tolerability consideration involves, helps patients use amlodipine effectively and know when to discuss adjustments with their provider. Amlodipine is available in 2.5 mg, 5 mg, and 10 mg tablets. Most patients begin at 5 mg once daily. Response is assessed after one to two weeks, and the dose can be increased to 10 mg if blood pressure reduction is insufficient and the lower dose was well tolerated. The 2.5 mg dose is reserved for patients with liver disease, elderly patients who may be more sensitive to blood pressure lowering, or patients already on multiple antihypertensives where additive effects require a gentler starting point. Because amlodipine's half-life spans thirty to fifty hours, full steady-state blood levels take about a week to establish after starting or dose changes. Providers typically wait at least one to two weeks after a dose change before assessing the full effect. This patience in evaluation is built into the dose titration schedule and reflects the pharmacokinetics rather than slow therapeutic action. Once-daily dosing regardless of food intake is a practical advantage. Amlodipine can be taken at any consistent time of day with or without meals. Missing a dose occasionally has less clinical impact than with shorter-acting antihypertensives because the long half-life prevents rapid drug level drops. Peripheral edema affecting ankles and feet is the most common tolerability concern. Rates of edema increase with dose, affecting roughly three to five percent of patients at 5 mg and up to ten percent at 10 mg. The swelling is not caused by fluid overload or kidney or heart dysfunction but by the fluid pressure shift resulting from arterial dilation. Elevating the legs, reducing sodium intake, and in some cases adding an ACE inhibitor or ARB can reduce edema without requiring a dose reduction. Amlodipine has an exceptionally favorable drug interaction profile compared to many antihypertensives. It is metabolized primarily by CYP3A4 but is not a strong inhibitor or inducer of this pathway, creating fewer significant pharmacokinetic interactions than diltiazem or verapamil. This simplifies combination therapy decisions. Common antihypertensive combination strategies include amlodipine with an ACE inhibitor or ARB, which addresses both vascular resistance and renin-angiotensin driven pressure, and amlodipine with a beta-blocker for patients who need both vasodilation and heart rate control. Multiple fixed-dose combination products combining amlodipine with other antihypertensives are available, simplifying pill burden. For patients navigating dosing or tolerability questions with their provider, reviewing information about norvasc amlodipine treatment decisions helps frame the reasoning behind dose selection and what options exist when tolerability issues arise. For broader context on calcium channel blocker therapy, antihypertensive combination strategies, and blood pressure monitoring, exploring blood pressure medication guidance and treatment options supports well-informed ongoing management.

Antibiotics After Cesarean Curb Infection in Obese Women

By www.medscape.com

LAS VEGAS — When obese women received a course of inexpensive antibiotics after cesarean delivery, surgical-site infections dropped by 60%, new research shows.

If this antibiotic strategy was implemented nationally, nearly 46,000 surgical-site infections and five maternal deaths would be prevented each year, at savings of more than $1 billion, investigators estimate.

"Even though the standard of care is to give antibiotics before the incision, in obese women, drug levels are lower," said lead investigator Carri Warshak, MD, associate professor of maternal–fetal medicine at the University of Cincinnati.

And with blood loss during cesarean delivery, "antibiotic blood levels are going to be even lower, and are basically gone by 4 hours after delivery," she told Medscape Medical News. At 4 hours, they're not healed and bacteria continue to get into the incision and uterus, especially in women with ruptured membranes."

Obese women make up a significant proportion of the 1.3 million annual cesarean deliveries. In fact, obesity complicates an estimated 30% to 40% of pregnancies, Dr Warshak reported.

An estimated 3% to 13% of all cesarean deliveries are complicated by surgical-site infections, and obese women are two to five times more likely to develop these infections.

High Risk for Infection

Here at the Society for Maternal-Fetal Medicine 2017 Annual Pregnancy Meeting, Dr Warshak presented results from a study that evaluated whether an extended course of antibiotics could reduce the rate of surgical-site infections in women with a body mass index (BMI) of at least 30 kg/m².

In the prospective, double-blind, randomized controlled trial, 192 women received cephalexin 500 mg plus metronidazole 500 mg administered orally every 8 hours for 48 hours and 190 received placebo.

The rate of tobacco use was high in both the antibiotic and placebo groups (27% vs 30%), as were rates of pregestational diabetes (16% vs 19%) and chronic hypertension (49% vs 51%). Average gestational age at delivery was 37.5 weeks in the two groups, and rates of multiples, primary cesarean, and pre-eclampsia were similar. All women received standard perioperative care, and the vast majority underwent low-transverse Pfannenstiel incision and suture skin closures.

The primary outcome was a surgical-site infection in the uterus or the incision. Secondary outcomes included any incision morbidity, cellulitis, endometritis, any fever, and wound separation.

Overall, the rate of surgical-site infection was 63% lower in the antibiotic group than in the placebo group. For the 119 women with ruptured membranes, it was 77% lower, and for the 264 women with intact membranes, it was 44% lower, although that difference was not significant. One woman included in this analysis had been excleded from the previous analysis because she no longer met the criteria for BMI.

Source: http://www.medscape.com/viewarticle/875067

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