Noooooooo!!!!!
I read your post and I must tell you that you need to rethink this.
I was once on antibiotic for 6 months for recurring streps till finally the spring came. Anyways, all that medication ruined my stomach lining and I have been suffering for 9 years now with antibiotic-induced colitis.
Another BAD side effect is that your immune system weakens and then when you really need the antibiotic for a bacterial infection, G-d forbid, your body will be so used to it that it won't help. Furthermore, many antibiotics leave dangerous toxins in their wake as the body is trying to fight a war inside.
Now, it doesn't sound like acne would require antibiotic because it's not bacterial. However, since I am not an MD or even a medical person, and I can't tell you about acne for sure, it just doesn't make ANY sense to pop antibiotics for it.
BUT, if you decide to take it etc. please, please, please take acidophilus with it. This is a probiotic: meaning good bacteria which will help balance your intestines with good bacteria after the antibiotic kills the bad and good stuff. Be sure to get a good brand that says it is live and needs to be refrigerated. Many brands are taken off the shelf and they lose the potency because they need refrigeration. "Natrens" is an excellent brand and is a bit pricey, but it's well worth it .
First, rethink it and ASK your Dr. about long term effects of the antibiotic and about acidophilus. A good Dr. will encourage you to take probiotics.
Good luck and all the best. Feel good.
P.S. I did not mean to scare you or anyone reading this, but because of my past experience, I learned the hard way that you must be an educated consumer.