What is Nephrotoxicity?
Approximately 20% of damage to kidney or nephrotoxicity happens due to drugs and this is more common in patients admitted to the hospital.
Acute kidney failure also known as acute renal failure can occur suddenly since the kidneys are unable to filter the toxic products from blood. This results in high levels of toxins in blood. It can be fatal in some conditions.
What is Drug-induced Nephrotoxicity?Some drugs used for treatment are known to cause nephrotoxicity, i.e. impair the functioning of kidney. These could be prescription or over-the -counter medications.
Drug induced nephrotoxicity occurs in patients with certain clinical conditions.
Nephrotoxic drugs generally induce inflammation in glomerulus and proximal tubules which disturbs the kidney functions and leads to toxicity known as glomerulonephritis and intestinal nephritis.
Which Drugs Cause Nephrotoxicity?Drugs which could cause nephrotoxicity include:
Chemotherapeutic agents to treat cancer
- Beta lactums like Penicillins and Cephalosporins
- Aminoglycosides antibiotics to treat Gram-negative infections like Gentamicin. Amikacin, Kanamycin, Tobramycin, Streptomycin and Neomycin
- Anti-fungal antibiotics like -
- Amphotericin B
- Non-Steroidal-inflammatory drugs (NSAID) like – Aspirin, Celecoxib, Diclofenac, Diflunisal, Etodolac, Ibuprofen, Indomethacin, Ketoprofen, Ketorolac Nabumetone, Naproxen, Oxaprozin, Piroxicam, Salsalate, Sulindac, Tolmetin
- ACE inhibitors like Benazepril, Captopril, Enalapril, Fosinopril, Lisinopril, Moexipril, Perindopril, Quinapril, Ramipril, Trandolapril
- Statins like - Atorvastatin, Fluvastatin, Lovastatin, Pravastatin, Rosuvastatin, Simvastatin and Pitavastatin
- Contrast dye
- Drugs of abuse like Cocaine
- Streptokinase inhibitors
- Some herbal drugs
What is mechanism of action of nephrotoxicity?The mechanism of drug-induced nephrotoxicity varies with the class of drugs. The drugs exhibit their toxic effect by affecting various microscopic components of the kidney.
The nephrotoxic antibiotics induce their effects by two different mechanisms:
- Penicillin and Cephalosporin type antibiotics show their effect by indirect action, which is due to antigen and antibody formation and is due to mechanism involving the immune system
- The Polymyxin and Sulfonamide type antibiotics have a direct effect on kidneys. They show significant nephrotoxicity, the clinical diagnosis is characterized by proteinuria, decreased clearance of creatinine, and cellular casts in urine