So you got sick, went to the doctor and received drugs, then feel better after a couple days; now what do you do with the rest of the prescription? Were the doctors conspiring together to make more money off of you? Doubtful. In reality, physicians give a specific number of days of pills (even though you may feel fine after only half) to combat and prevent antibiotic resistance like MRSA. If you stop taking these drugs when you feel better, it can cause you to become extremely ill with a disease that is no longer treatable and can be spread to other people. The same can be said with flushing or throwing away prescriptions instead; these antibiotics get into the environment and kill certain species of microbes allowing more dangerous ones to grow in their place. The CDC is also a great resource for answering any additional questions about this.