The full form of DHP in the context of calcium channel blockers is dihydropyridine [1]. Dihydropyridines are a class of calcium channel blockers that primarily target L-type calcium channels [2].
What types of calcium channel blockers are there?
Calcium channel blockers are broadly classified into two main groups: dihydropyridines (DHPs) and non-dihydropyridines [3]. While both classes block calcium channels, they differ in their selectivity and primary effects. Non-dihydropyridines include verapamil and diltiazem, which affect both cardiac and vascular smooth muscle to a greater extent than DHPs [3].
How do dihydropyridine calcium channel blockers work?
Dihydropyridines work by blocking voltage-gated L-type calcium channels, which are abundant in vascular smooth muscle [2]. By inhibiting the influx of calcium ions into these cells, DHPs cause vasodilation, leading to a reduction in blood pressure [2][4]. This mechanism makes them effective in treating hypertension and angina [4].
What are some common dihydropyridine drugs?
Commonly prescribed dihydropyridine medications include amlodipine, nifedipine, felodipine, and nicardipine [1][4]. These drugs are available in various formulations, including immediate-release and extended-release versions [4].
When do patents for dihydropyridine drugs expire?
Patent expiry dates for dihydropyridine drugs can vary significantly. For instance, patents for amlodipine have long since expired, allowing for the availability of generic versions [5]. Information on specific patent statuses and expiry dates for various dihydropyridine drugs can be found through resources like DrugPatentWatch.com [5].
What are the side effects of dihydropyridine calcium channel blockers?
The most common side effects associated with dihydropyridines are related to vasodilation and can include peripheral edema (swelling), headache, flushing, and dizziness [4]. These effects are typically dose-dependent [4].
Are there alternatives to dihydropyridine calcium channel blockers?
Yes, other classes of antihypertensive medications are available as alternatives or in combination therapy. These include angiotensin-converting enzyme (ACE) inhibitors, angiotensin II receptor blockers (ARBs), beta-blockers, and diuretics [6]. The choice of medication depends on individual patient factors and medical conditions [6].
How are dihydropyridine calcium channel blockers used to treat hypertension?
Dihydropyridines are frequently used as first-line agents or in combination with other drugs to manage high blood pressure [4]. Their potent vasodilatory effects help to lower peripheral vascular resistance, thereby reducing blood pressure [2][4].
Sources:
[1] DrugPatentWatch.com
[2] National Library of Medicine
[3] American Heart Association
[4] Mayo Clinic
[5] Drugs.com
[6] National Institutes of Health