Question 75

Rifampin turns urine orange-red.

Rifampin is known to cause a discoloration of urine, resulting in an orange-red appearance. This side effect is due to the drug's excretion and is a common characteristic associated with its use.

A) Rifampin

Rifampin is an antibiotic that is primarily used to treat tuberculosis and other bacterial infections. One of its well-documented side effects is the alteration of urine color to orange-red, which is caused by the metabolism and excretion of the drug.

B) Ampicillin

Ampicillin is a penicillin-type antibiotic that is not associated with any significant changes in urine color. Its primary side effects are gastrointestinal in nature, and it does not cause the urine to turn orange-red.

C) Ciprofloxacin

Ciprofloxacin is a fluoroquinolone antibiotic that does not typically cause urine discoloration. While it has its own set of side effects, orange-red urine is not one of them, making this option incorrect.

D) Erythromycin

Erythromycin is a macrolide antibiotic that is also not linked to changes in urine color. Similar to ampicillin and ciprofloxacin, it does not cause the urine to become orange-red, rendering this option incorrect.

Conclusion

Rifampin is definitively the correct answer, as it is the only medication among the options that is known to change urine color to orange-red. The other options, including ampicillin, ciprofloxacin, and erythromycin, do not cause this specific side effect, highlighting the unique characteristic of rifampin in this context.