IIRC, there are only two countries that allow TV ads for prescription meds: the USA and New Zealand.
I can remember when they weren't allowed here, either, but were eventually given the go-ahead as long as they always included the phrase "ask your doctor".
Turns out, asking your doctor is no guarantee you'll get good information. I did ask my doctor. Their information comes from a book called the
Physician's Desk Reference, which is a for-profit
publication whose data is supplied by the pharmaceutical companies. It is basically a compilation of all those little 4-point-font leaflets that come with your prescription pills.
Your doctor goes by this book when deciding what you need and how much of it you need to take. Dosages are routinely too high, because drug companies want to a) make sure you get a high-enough dose to notice, and b) have to buy more of it.
I found out that one of the BP drugs I was taking was
4 times the recommended dosage, according to an alternative
reference that's actually written by doctors, not multi-national drug companies. So I took it upon myself to cut my dose in half, monitoring my blood pressure before and after. My BP did not rise as a result of taking half the medication. Later, I informed my doctor that I'd done this. He just nodded and updated my chart accordingly.
If you or anyone in your family takes prescription drugs, you owe it to yourself to read a book called "
Overdose: The Case Against the Drug Companies". It was a real eye-opener to me. Before reading it, I assumed "ask your doctor" was all the advise I needed.