Erin: What university do you go to? prozac weekly prescribing information “Expanding the list of the prohibited substances is quite a time-consuming process that takes up to half a year, and in the meantime our rights and opportunities are limited. But the drug business is developing so rapidly that they are already prepared for the ban of the new substances, and again new ones emerge in the market. We think, of course, it would be better if we could be much quicker to include the new substances in the list.