Chlamydia infection. Is there a good method that can eradicate it in 48 hours?

For sure. Chlamydia is usually treated with a single dose of Azithromycin 1g. One's partner should be treated as well. There are other treatments which take longer to work and are often not as effective.
Got a hot date? You can take a one dose antibiotic pill to eradicate the infection but recommend using condoms until the infection is proven to have resolved. The only way to recheck is to wait at least 3 months to prove it is gone.

Related Questions

I have taken 4 x 250g of azithromycin for chlamydia infection, and had a episode of diarrhoea 6 and 1/2 hours later, is it still effective?

Side Effect. It's likely that the diarrhea you experienced was a side effect of the azithromycin so you should be fine, although I am sorry you had to go through that, that's never fun. If you find you are still experiencing symptoms of the chlamydia then talk to your doctor about other treatment options.