Drug prices are subject to change without prior notice or announcement. When changes to drug prices are made there may or may not be an announcement regarding that change. The server is heavily focused on the economy. In an economy, prices change based on supply and demand. Without this, hyper-inflation occurs. There have been some complaints about prior notice not being given, but if you think about it, your local supermarket doesn't inform you when the price changes for milk every single time. Same goes for here. Prices for drugs will go up and down in order to maintain a stable economy. I recommend investing in more than one drug at a time. Don't become too reliant on one drug type.