Based on my personal experience, it's a good opportunity to buy medications online. First of all, it's a private way to buy prescription and over-the-counter medications. Also, it saves money and time. But don't forget to choose a licensed pharmacy only. I prefer Canadian Pharmacy.
I think so. If you use a good one everything should be fine. I like the service from eDrugStore.com a lot, for example, and I think it is a really good one. Have a look there, hope you will like it too, good luck!
I would try to avoid all the online pharmacies without reviews and stable positive reputation. If you're looking for a certain pharmacy recommendation, save this keeps customer service for future.