Greater Toxicity Associated with Levaquin? Author: Sam from

This is a post from Sam at  I am not sure how valid this is.   Sam has been poisoned by a quinolone is trying to help educate others on quinolone toxicity. I granted him access due to my difficulty in the frequency of posting on this blog as a result of my severe Levaquin poisoning.   

Is Levofloxacin (Levaquin) more toxic than other quinolones?

Levofloxacin, a modified form of ofloxacin, is one of the most potent quinolones (about twice as potent as ofloxacin). Therefore, does levofloxacin exhibit a higher level of toxicity and rate of adverse reactions when compared to other fluoroquinolones?

According to various research sources, this indeed appears to be the case. There is a startling difference in number of adverse reaction reports between Levaquin and Cipro, the top 2 most prescribed quinolones, in itself. Looking at Levaquin has over 2000 reports of side effects, while Cipro has 73.

Moreover, according to a research study by L Mandell, MD FRCPC and G Tillotson, MSc FRSM, Levofloxacin may have a higher rate of side effects compared to other fluoroquinolones of the third generation. See the table below (note that the information is directly from the drug companies and the true rates of side effects are much higher):

Comparison of adverse drug reactions associated with some approved fluoroquinolones (%)

Reaction Levofloxacin   Gatifloxacin     Moxifloxacin  
Reference PI 50* 51 31 30 51 52
No patients NR 2252 1655 15,625 6170 6500 18,409
Nausea 7.1 9 2.8 4 8 0.3 5.7
Diarrhea 5.6 4 1.7 1.4 6 0.9 2.4
Headache 6.4 4 0.5 0.9 2 0.1 <2
Vomiting 2.2 2 0.6 0.7 2 0.2 <1
Vaginitis 1.6 5 <1 <1 <1 NI <1
Dizziness 2.9 3 1.3 NR 3 0.3 2.3
Taste perversion 1.0 2 0.8 0.5 <1 NR <1
Discontinuations 3.4 3.2 NR 3.1 NR NR NR

This hypothesis also correlates with the speculation of Jay S Cohen, MD, that there may be a “previously unrecognized tendency toward greater neurotoxicity with levofloxacin.” (

Another source from suggests that Levofloxacin is one of the most potent quinolones in terms of side effects:

According to T Boomer, a fluoroquinolone researcher, “500 mg of levaquin tends to cause as much damage as 1000 mg of ciprofloxacin.”

In conclusion, levofloxacin may exhibit higher rates of toxicity when compared with older quinolone agents such as ciprofloxacin, and with newer quinolones including moxifloxacin. This observation could explain the abnormally high incidence of adverse reaction reports with Levaquin.

Post authored by Sam from

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6 Responses to “Greater Toxicity Associated with Levaquin? Author: Sam from”

  1. bob says:

    I took offloxacin and its as bad a reaction as many have suffered with other FQs. Moving the flourine atom around may confude the bateria but it did not confudse my body when the shit hit the fan. My symptoms which are nudging towards fifty odd are symptomtic of quinolone poisoning. They are all bad to the unlucky people that are allergic to them.

  2. Sam says:

    I can understand, Levofloxacin is a modified form of Ofloxacin.

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