Can long distance travel affect menstrual cycle?

My friend has lately come back from a holiday within Asia. This was the first time she have flown.. She was unwell while away and during this time, her spell came on rash (which never happens to her).. Since her return, her interval was 10 days in arrears and when it came on it have been intensely heavy.. She have been on Paludrine/Avloclor malaria tablets so we are wondering if these too, could own an affect on her.. plus she had to run two courses of antibiotics during this time..

Has anyone experienced such a situation..?
Answers:

Is it true that while ur drinking alcohol & take ur birth control that the birth control wont pocket its effect?

yeah my friends cycle got screwed up after malaria tablets, she be like clockwork but when she come home her period be 2 weeks late after over 6 weeks late. its hindmost to normal in a minute. no need to verbs. XXX

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yes, it customarily does, i have see it happen for my wife. The antibiotics also are one of the cause,

Tampon help?

I find any type of long distance cycling troublesome... i've get a racer though, and I heard the saddle on a menstrual cycle aren't as rough on a55?