Frequencies in Table 5 are defined using the following convention: very common (≥1/10), common (≥1/100 to <1/10), uncommon (≥1/1,000 to <1/100), rare (≥1/10,000 to <1/1,000), very rare (<1/10,000), not known (cannot be estimated from the available data). Within each frequency grouping, undesirable effects are presented in order of decreasing seriousness. (See Table 5.)

Other undesirable effects which have been associated with fluoroquinolone administration include: attacks of porphyria in patients with porphyria.
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