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It's not generally used to treat Trichomoniasis. Flagyl is the first choice in treating this STD.
If you are not 100% sure you have Trichomoniasis or if you don't have a full course of antibiotics and if they are not a new prescription I highly recommend seeing your doctor. As you can actually cause your body to build a resistance to the antibiotics and could have a hard time clearing the infection.
Click here to read more on Trichomoniasis
It can be used, but it's also possible it may not be effective in treating it either. If you are unsure, it's always best to check with your doctor to make sure the infection is gone. If it's left untreated it could lead to further complications. So although it's not the first choice, it can be used.
Lindie is offline, so I will attempt to add some more information for you. Please accept one of Lindie's answers.
The official treatment guidelines do not recommend azithromycin or clarithromycin, not even as alternative treatments. The link above is a commercial link, not a link to the Center for Disease Control or the National Institutes of Health. There is considerable antibiotic resistance to many of the STDs and you would need to be tested to see if you still carry trichomoniasis. Odds are very good that you do, since macrolide antibiotics are not used for treatment. If you are "cured" then consider it serendipity. It isn't evidence-based medicine. Below are links to official sites that discuss the treatment guidelines. I urge you to be tested and get the proper treatment.