You can purchase a medicated salt block at your local farm and ranch supply store. Tack and feed stores will also sell them.
None because no such block exists.
Nowhere because no such salt or mineral block exists.
NaCl. That's it: just plain table salt. And there really is no such thing as a "medicated" salt block.
None. No such salt block or loose mineral mix exists.
None. No such salt block, medicated block nor loose mineral mix exists.
Safe-Guard makes a medicated dewormer salt block, and Bovatec makes a medicated block made to increase average daily gain of pasture stocker, slaughter, feeder cattle and beef/dairy replacement heifers. However, no other manufacturer makes any type of medicated salt block that contains the mythical ephedrine that is claimed to be extracted and used for crystal meth.
There are no salt or mineral nor medicated mineral blocks that contain any form of ephedrine in them. Sick animals are treated by antibiotics via injection, not by just giving them a "medicated" salt block.
None. There is no such thing as a medicated salt block, especially one that contains ephedrine that you can use to make crystal meth!!
They are not and never have been. Ephedrine is not found in medicated salt blocks.
There really is no such salt block or mineral mix. You can check with your veterinarian or those companies that make livestock salt blocks but it's highly likely you will not find such an ingredient in salt licks for cattle.
brown and black
Bovatec or Safe-Guard medicated blocks should be placed out in the pasture to encourage more grazing in that pasture and less traffic at the water trough. Most people like to put out salt blocks close to a water source, but in a pasture environment, to encourage livestock to graze a certain area that is some distance from their favorite watering area, a salt block should be placed in that vicinity.