I dug further into CCBs. It’s complex as there are different generations, dihydropyridine (DHP) vs. non-DHP, L-type, T-type, N-type (and their combinations), BBB-crossing or not, centrally vs. peripherally, lipophilic or not, etc.
Amlodipine is a peripheral-acting third-generation L-type DHP CCB that does not cross the BBB easily.
Some papers suggest that DHP CCBs that cross the BBB easily (e.g. felodipine, isradipine, lacidipine, lercanidipine, nicardipine, nifedipine, nimodipine, nisoldipine, and nitrendipine) are better:
Brain-penetrant calcium channel blockers are associated with a reduced incidence of neuropsychiatric disorders 2022
In people with no prior history of psychiatric or neurodegenerative disorder, there was a significantly lower incidence of most disorders with BP-CCBs compared to amlodipine, with risk ratios ranging from 0.64 to 0.88 and an overall risk ratio of 0.88, i.e. a risk reduction of 12%.
Antihypertensive Agents and Risk of Parkinson’s Disease: A Nationwide Cohort Study 2014
Due to the differences in lipophilic properties, we further distinguished CCBs into the central-acting ones that could cross the blood-brain barrier (felodipine, nifedipine, lercanidipine, nitrendipine and lacidipine) and the peripheral-acting ones that are thought to not cross blood-brain barrier as readily (amlodipine, verapamil, and diltiazem). We found any use of central-acting CCBs, rather than peripheral-acting ones, was associated with a decreased risk of PD (adjusted HR, 0.69; 95% CI, 0.55–0.87, table S4). Among the individual dihydropyridine CCB, the use of felodipine was found to have a reduced association with PD, with a potential dose-response relationship (HR, 0.72; 95% CI, 0.54–0.95 for any use; HR, 0.54; 95% CI, 0.36–0.80 for higher cumulative use). There was also a decreased association between higher cumulative use of amlodipine and risk of PD.
Non-amlodipine CCBs don’t do as well as amlodipine for PD prevention in the above paper, but they’re also used way less often, which might explain the wider CIs.
Felodipine seems interesting: Neuro-modulatory impact of felodipine against experimentally-induced Parkinson’s disease: Possible contribution of PINK1-Parkin mitophagy pathway 2024
But in the EPITERNA study, only lercanidipine 20 mg might do a bit better than amlodipine 5 mg and felodipine didn’t look especially good:
And in this paper, amlodipine reduced ACM more than felodipine and other DHPs (mostly nifedipine and felodipine?): Calcium channel blockers, survival and ischaemic stroke in patients with dementia: a Swedish registry study 2020
The lack of edema with lacidipine and lercanidipine makes them interesting. Lercanidipine apparently “prevents renal damage induced by angiotensin II and demonstrates anti‑inflammatory, antioxidant, and anti‑atherogenic properties through an increasing bioavailability of endothelial nitric oxide.” (Lercanidipine in the Management of Hypertension: An Update 2017) But they’re way less studied (and prescribed) than amlodipine: 14 RCTs ever done for lacidipine (0 ongoing), 13 for lercanidipine (1 ongoing), and… 681 for amlodipine (63 ongoing)!
So, I conclude the same thing as this paper: fourth-generation DHP CCBs lacidipine and lercanidipine look great, but we need more data; in the meantime, amlodipine is still the king: Newer Calcium Channel Blockers 2022
There is plenty of clinical evidence supporting the advantages of newer L-/T- and L-/N-type CCBs over conventional L-type CCBs. However, this evidence may be biased in many ways due to the small sample size, short follow-up and open-label design of several studies. Due to the lack of large and long-term studies, data on cardiovascular outcomes and mortality is scarce for most of the newer agents. Conversely, amlodipine has been studied in several large, long-term trials, such as the antihypertensive lipid-lowering treatment to prevent heart attack trial that enrolled >33,000 patients and had a follow-up of about 5 years. In addition, the safety and efficacy of amlodipine for enhancing patient outcomes are firmly established. Despite the limitations of current clinical evidence, the novel CCBs herald a new era in antihypertensive therapy. More well-designed, large-scale and long-term clinical trials involving these agents are needed to aid clinicians in making a more informed decision about the most appropriate CCB for their patients.
What do you think @DrFraser?