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From SNPedia

Magnitude 2.5
Summary more stimulated by coffee
Criteria Gs157/criteria

You appear to have a common genotype in the gene CYP1A2 which metabolizes coffee more slowly than some other forms. The same amount of caffeine will tend to have more stimulating effect on slow metabolizers than on fast metabolizers.

Ciprofloxacin is also metabolized by CYP1A2, but is unclear if your genotype should influence its effect.