Talk:Nifedipine

Nifedipine and other calcium-channel blockers may interfere with the normal development of sperm, potentially reducing the fertility of men who take it. It has been studied by at least one researcher as a potential reversible male contraceptive, however, it is not being actively pursued as a contraceptive by any major pharmaceutical companies, possibly because of perceptions that publicizing its contraceptive effects would negatively impact sales as a blood-pressure medication, or because an expired patent and the availability of inexpensive generics makes research into new uses an unappealing financial prospect.

At least one case of possible Nifedipine-induced infertility has been reported in the literature. .

Couples who are having difficulty conceiving should consult their doctor if the man is taking nifedipine.

The apparent contraceptive mechanism is an inhibition of the normal mannose lectin coating of the spermatozoa's outer membrane; this coating is necessary for correct binding with the egg. This may be caused when a greater-than-normal amount of cholesterol is integrated into the membrane, stiffening the membrane and preventing normal outward migration of mannose from the interior.^[1][2]

This is completely disproportionate to the rest of the article. One researcher pushing it and one case report on infertility make this too obscure for a general encyclopedia. JFW | T@lk 22:54, 10 October 2006 (UTC)

I don't think it was right to remove this. Safety warnings are of the utmost importance. --IO Device (talk) 22:10, 22 March 2009 (UTC)

Well, i came here looked specifically for this information... and despite a passing familiarity with mediawiki, i am not a wikipedian. To me, at least, this is a highly relevant section. 66.173.237.26 (talk) 03:26, 17 July 2011 (UTC)

Tocolysis for pregnancy is an off-label use, not a dosage.—Preceding unsigned comment added by 63.165.50.227 (talk) 20:47, 20 January 2009 (UTC)

This medication is deadly if taken in overdose. It should be kept out of the reach of children and anyone suspested of being depressed or suicidal. —Preceding unsigned comment added by 108.3.64.13 (talk) 16:13, 10 January 2010 (UTC)

Could someone mention Procardia XL dosage form release mechanism. Specifically that it is a plastic shell with a small opening that lets the drug out slowly. This is important since the nifedipine is released later and over a different kinetic time period. Also the shell can form a pseudobezoar within the patient. --74.179.121.14 (talk) 16:15, 10 April 2011 (UTC) Procardia XL is an osmotic push-pull system. See Wikipedia "Osmotic controlled-release oral delivery system" or abbreviated OROS for an explanation. Because the shell of the system cannot be digested and is emptying within about 24h, it can in rare cases be collected in the stomach. The stomach has an sphincter muscle that is controlling the food and liquid transport to the small intestine. Larger bodies like the empty OROS shell may not pass this sphincter. This empty shell is called a bezoar. dieter.e.becker@gmail.com

Is this drug a cyp3a4 inhibitor? I know it is a substrate, but data on whether or not is inhibits said enzyme is contradictory at best. I know it could THEROTICALLY produce inhibition via competing with other drugs for the limited enzyme, but does this translate to having any useful inhibtion activity, and if so would it be worth taking as a inhibitor??? — Preceding unsigned comment added by 24.98.250.155 (talk) 23:18, 14 September 2011 (UTC)

The following was added by Herizora‎:

It contains only primary sources, and the titles of the journal articles don't give the impression that they are primarily about the mechanism of nifedipine. I would recommend WP:MEDRS-compatible secondary sources in the first instance. JFW | T@lk 22:11, 26 October 2014 (UTC)

PMID 19475779 is a review of the GITS system. 2009. A secondary source. JFW | T@lk 23:51, 17 November 2014 (UTC)

Hello fellow Wikipedians,

I have just modified one external link on Nifedipine. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20150910023142/http://www.dr-bob.org/tips/split/Nifed-MAOI-hypertension.html to http://www.dr-bob.org/tips/split/Nifed-MAOI-hypertension.html

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{source check}} (last update: 5 June 2024).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.—InternetArchiveBot (Report bug) 01:41, 15 December 2017 (UTC)

Citing "Medical uses" > "High blood pressure" > 2nd paragraph:

Sublingual administration of nifedipine promotes a hypotensive effect via peripheral vasodilation. It can cause an uncontrollable decrease in blood pressure, reflex tachycardia, and a steal phenomenon in certain vascular beds. There have been multiple reports in the medical literature of serious adverse effects with sublingual nifedipine, including cerebral ischemia/infarction, myocardial infarction, complete heart block, and death.

Citing https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3552217/ > heading "Discussion" > 2nd paragraph:

Sublingual nifedipine causes blood-pressure lowering through a peripheral vasodilation. It can cause an uncontrollable decrease in the blood pressure, reflex tachycardia, and a steal phenomenon in certain vascular beds. There have been multiple reports in the medical literature of serious adverse effects with sublingual nifedipine, which include cerebral ischaemia/infarction, myocardial infarction, complete heart block and death.

These passages are virtually identical. So, who copied who?

I found this post to dr-bob.org from June 14, 2008. It cites an article from Medscape.com dated December 02, 2002. -- Mentropane (talk) 06:42, 28 November 2019 (UTC)

Moreover, this "steal phenomenon" requires further explanation.

Furthermore, there are sources suggesting that nifedipine is a suitable choice of drug for treating hypertensive emergencies: <https://www.bmj.com/content/286/6358/19>. According to this article, nifedipine typically improves cerebral blood flow.

-- Mentropane (talk) 03:04, 28 November 2019 (UTC)