What else can I do to prevent getting pink eye again?

No contact lenses, and new pillow cases every night (sometimes it's just easier if you put a hand or dish towel down instead if you have a bunch of those). Also, be careful with reusing whatever it is you wash/dry your face with - clean wash cloth, etc.

Make up and make up brushes are a big source of reinfection. Toss your mascara, wash or replace your make up brushes, you may need to replace eyelid primers, eye creams and eye shadows etc too. Oh and replace make up sponges if you use them.

I'm not familiar with the dosage of antibiotic eyedrops, but, would one prescription contain enough liquid for two full courses? Or does your having drops 'left over' mean that you didn't finish the first course fully? With antibiotics, if you don't take them for the complete # of days prescribed, you're killing off the weaker germs and leaving the stronger ones to keep reproducing. (I also don't know how long it takes liquid antibiotics to go inert, I'd call your doctor's office to find out if they need to call in a refill, or if you need to be switched to a different antibiotic.)

Years ago I got pink eye which was cleared with antibiotic eye drops. Several weeks later it came back. After a couple visits to my PCP, I was referred to an ophthalmologist, who diagnosed it as http://en.wikipedia.org/wiki/Blepharitis (my symptoms were almost exactly like normal conjuctivitis except recurring) and prescribed a regimen of warm compresses on my eyes everyday. He said it was a chronic condition and I might need to keep up with the routine indefinitely, but after a month or two I stopped and it didn't return. If it doesn't clear up with the eye drops or comes back again, I'd suggest seeing an eye doctor in case that's what you have.

Just chiming in to say this happened to me, and it was my contact lens case. I had thrown out the contacts I'd had during the first infection, but hadn't thought about the case. Just a thought.

I have dry eye issues and keep lubricating eye drops on hand. They don't have any redness relieving properties, just the lubricant. My favorite is Visine Tears Dry Eye Relief, but there are a number of different kinds with slightly different lubricants.

As for daily relief eyedrops, you will want Systane Ultra. They are -the best- eye drops. They're thick, almost very slightly greasy, and are ridiculously amazing. I used to use eye drops like 3-4 times throughout the day. Now I only need them once. Also expensive, unfortunately, so check online for a coupon or something.

If you are a makeup wearer, toss ALL of your eye makeup. I know it isn't cheap, but it is definitely a great way to ensure you aren't recontaminating yourself.

Toss all your eye makeup (if applicable), wash your bed linens in hot water, throw away any contact lenses you've worn in the past three months (just to be sure), and get some lubricating eye drops.