Sadly you won't get rid of C on with just clarithromycin, you need three antibiotics .
There are three established (i.e. proven to work) protocols for C pn, they are all on the website that xrunner linked to. You need to use one of those.
You'll need to stick at the antibiotics for at least 6 months to eliminate this infection. It is well worth sticking at it. Recent research found that 90 percent of people who had heart attacks have this infection in them, and it is believed to greatly increase risk of heart disease if you live with it chronically. It's well worth getting rid of.
As already said, you absolutely must take probiotics all the time. take them 2 hours away from your doses of antibiotics and eat them with raw veg, fresh fruit and other prebiotic foods that will help them establish live colonies.
DO NOT PUT YOUR FAITH IN ONE BRAND OF PROBIOTICS
No matter how expensive or top quality they are, you can always get batches with no live bacteria in them, you will never be able to tell (until you have clostridium difficile and it is too late). You must buy different types of bacteria and different brands and keep mixing them. You should also include live yeast as Ema mentioned.
I always used to take VSL 3, which is great when live, but I then found out many packs of it are all dead. It is too sensitive to temperature changes and a tiny hitch in the supply chain makes the whole lot kick the bucket inside its sachet. It has been banned in Germany for this reason.
You need at least 25 billion bacteria a day to start with, at any sign of the mildest diarrhoea this means you need to increase your dose till the diarrhoea clears up and stay on that higher dose.
I've been taking 4 antibiotics for the last 18 months, if you follow this, your guts will be fine (mine have actually improved on this protocol). I still haven't got rid of C pn yet. it is a very persistent infection.
If you get candida, the best thing to eliminate it (and I have tried all of them) is an enzyme called Candex. This was recommended by Richvank. It has no side effects and works like magic!
Last thing, take n acetyl cysteine at least 600mg twice a day. That kills the cystic forms of the bacteria, and it also breaks down their biofilms. They form biofilms in your heart and lungs, they are horrible little things.