SACRAMENTO, Calif. — To make a long, expensive story short, my pharmacy recently made a mistake on a monthly prescription with a new insurance company and charged me $200 for what used to be a $20 prescription bill. 

Several phone calls and headaches later, it got resolved, but it got me thinking… how often does this happen? Now, I'm on a mission to save you money when it comes to the drugstore and your medications.

If you're thinking my copay is going to be the same no matter where I buy it, well, that's not always the case.

Many people pick a pharmacy close to their home. This makes sense, but the real question should be, where is the closest Preferred Pharmacy? Before choosing a drugstore, ask your doctor, insurer, or your employer's human resource department for a list of preferred pharmacies.

Have you ever used a coupon for your prescription? Check out to compare prices for your prescriptions.

And before you throw out your prescription medicines, they might last a little longer than you think. ABC10's Walt Gray discovered prescriptions might last longer than prescription companies want you to know.

Continue the conversation with Brittany on Facebook. If you're viewing on the ABC10 App, tap here for multimedia