As some have pointed out, the rich and the powerful will limit the drugs to mainly themselves and their followers. Insurance companies won't cover the drug cost because Big Pharma would keep the price high to make money. Big Pharma would make some of the drugs available to the public at lower costs to give hope to the millions who would never receive it.
Among the other problems, a reverse-aging drug could/would lead to longer lives and that will affect the economies of the world. If the general population were to have easy access to the drugs Social Security and Medicare would go broke because you would have millions of people living to 100 or longer collecting benefits decades longer than they normally would. To counteract that happening, the retirement age for Social Security and Medicare would be raised requiring people to work into their 80s. the alternative to this is for the government to take control of the drugs and limiting it's distribution to only a few, mainly the people in power.
Another problem would be food production. With increased lifespans the world's population would increase putting pressure on the ability of countries to feed their citizens, provide clean water, sanitation, etc... Resources to support the increased populations would strain the ability of countries to meet their needs. This would result in the rise of authoritarian regimes that would be lead by those who have no hesitation to go to war with their neighbors to obtain those resources which, IMO, would lead to multiple war and or global wars that would set humanity back a hundred years or more.
Now if the drugs were to simply make specific organs like new without increasing life expectancy, then it would be a major development provided it's available to the average citizen.
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