What is the problem when tobramycin and gentamicin are administered together?

What is the problem when tobramycin and gentamicin are administered together?

• A. There is no interaction
• B. They are both penicillin antibiotics
• C. There is a drug-drug interaction between aminoglycosides
• D. There is a drug-drug interaction and both are aminoglycosides

Answer: (D)

Using two drugs that share the same toxicity risks can raise the chance of harmful side effects. Gentamicin and tobramycin are both aminoglycosides, and their main dangers are nephrotoxicity (kidney injury) and ototoxicity (hearing or balance problems). When given together, these risks add up rather than cancel out, and there’s usually little added antimicrobial benefit from using two drugs of the same class. They are not penicillin antibiotics, so that option isn’t correct. So, the situation is a drug-drug interaction because two aminoglycosides are involved, which is why this pairing is avoided or carefully monitored.

Using two drugs that share the same toxicity risks can raise the chance of harmful side effects. Gentamicin and tobramycin are both aminoglycosides, and their main dangers are nephrotoxicity (kidney injury) and ototoxicity (hearing or balance problems). When given together, these risks add up rather than cancel out, and there’s usually little added antimicrobial benefit from using two drugs of the same class. They are not penicillin antibiotics, so that option isn’t correct. So, the situation is a drug-drug interaction because two aminoglycosides are involved, which is why this pairing is avoided or carefully monitored.