In a long-overdue move to regulate antibiotic use in cows, pigs, chickens and other livestock and poultry, the FDA will be implementing new guidelines in regards to the availability of antibiotics.
Rather than being available over the counter (and virtually ubiquitous) as they are now, antibiotic use will now be overseen by veterinarians and available by prescription only. This should limit widespread use of antibiotics, which puts animals and humans at risk of drug-resistant diseases and unnecessary side effects to the antibiotics themselves, which are unnecessary in healthy animals.
This is arguably the most important measure in meat and poultry regulation in recent memory. This action was taken in lieu of outright banning or restriction of drugs individually, instead leaving the decision on whether to use a medication up to trained vets.