Tetracycline is Not Available at the Pharmacy. Has It Been Discontinued? Why?

During my teen yrs I used tetracycline for short periods (around that time of month when I would have breakouts I'd use it for 3-4 days and it kept my acne away.) In my 20s I was on birthcontrol for 10 yrs and didnt have acne. At 30 I got off bc. Now at 41 the last 3 yrs I've had the worst breakouts. I recently tried doxycline (which I dont like) for a month and saw no improvement in my acne. I've tried topicals (tazorac/retin-a) but it caused so much damage to my skin.