I never say never especially on this website, but normally
Flomax does not cause kidney/renal problems including elevated creatinine levels. Only possibility is from an overdose but I'm assuming that is not the case. The elevated creatinine levels could be caused by many different things and I would assume it is probably something else than the flomax.
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---I answer questions to the best of my ability, but with always limited knowledge of the patient's situation and no ability to see your chart or full medical history my advice is limited and should also be confirmed with your own doctor/pharmacist/etc. Also, I do not promote following my advice without proper approval from your doctor either--
Dr. B
Tamsulosin Hydrochloride- Side effects 
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