Make sure that your research very well your triple therapy before you take it; you have to be well prepared to take it; I just ordered the second line and will only take it in a few weeks to give my body a break from 21 days of Metronidazole I took 2 weeks ago; you do not want your body to take too many ills and become resistant to the drugs.
The more you wait; the better it is, I think. Giving the body to heal from medications; also, with the second line treatment, there are food restrictions; you must not eat anything that has any kind of alchol (tyramine?) in it; like aged cheese, processed food, soy sauce, broad beans, avacado, etc. you can obtain the list of foods to be avoided from Australian CDD; if not I can post it.
WHat are your symptoms and how long have you had them?