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Mycifradin Side Effects

Generic name: neomycin

Medically reviewed by Last updated on Sep 1, 2022.

Note: This document contains side effect information about neomycin. Some dosage forms listed on this page may not apply to the brand name Mycifradin.

Applies to neomycin: oral solution, oral tablet.


Oral route (Tablet; Solution)

Systemic absorption of neomycin occurs following oral administration and toxic reactions may occur. Patients treated with neomycin should be under close clinical observation because of the potential toxicity associated with their use.Neurotoxicity (including ototoxicity) and nephrotoxicity following the oral use of neomycin sulfate have been reported, even when used in recommended doses. The potential for nephrotoxicity, permanent bilateral auditory ototoxicity and sometimes vestibular toxicity is present in patients with normal renal function when treated with higher doses of neomycin and/or for longer periods that recommended. Serial, vestibular, and audiometric tests, as well as tests of renal function, should be performed (especially in high risk patients).The risk of nephrotoxicity and ototoxicity is greater in patients with impaired renal function. Ototoxicity is often delayed in onset and patients developing cochlear damage will not have symptoms during therapy to warn them of developing eighth nerve destruction and total or partial deafness may occur long after neomycin has been discontinued.Neuromuscular blockage and respiratory paralysis have been reported following the oral use of neomycin. The possibility of the occurrence of neuromuscular blockage and respiratory paralysis should be considered if neomycin is administered, especially to patients receiving anesthetics, neuromuscular blocking agents such as tubocurarine, succinylcholine, decamethonium, or in patients receiving massive transfusions of citrate anticoagulated blood. If blockage occurs, calcium salts may reverse these phenomena but mechanical respiratory assistance may be necessary.Concurrent and/or sequential systemic, oral, or topical use of other aminoglycosides, including paromomycin and other potentially nephrotoxic and/or neurotoxic drugs such as bacitracin, cisplatin, vancomycin, amphotericin B, polymyxin B, colistin, and viomycin should be avoided because the toxicity may be additive.Other factors which increase the risk of toxicity are advanced age and dehydration.The concurrent use of neomycin with potent diuretics such as ethacrynic acid or furosemide should be avoided since certain diuretics by themselves may cause ototoxicity. In addition, when administered intravenously, diuretics may enhance neomycin toxicity by altering the antibiotic concentration in serum and tissue.

Serious side effects of Mycifradin

Along with its needed effects, neomycin (the active ingredient contained in Mycifradin) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking neomycin:


  • Any loss of hearing
  • clumsiness
  • diarrhea
  • difficulty in breathing
  • dizziness
  • drowsiness
  • greatly decreased frequency of urination or amount of urine
  • increased amount of gas
  • increased thirst
  • light-colored, frothy, fatty-appearing stools
  • ringing or buzzing or a feeling of fullness in the ears
  • skin rash
  • unsteadiness
  • weakness

Other side effects of Mycifradin

Some side effects of neomycin may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

  • Irritation or soreness of the mouth or rectal area
  • nausea or vomiting

For Healthcare Professionals

Applies to neomycin: compounding powder, oral solution, oral tablet.


The most commonly reported side effects included diarrhea, nausea, and vomiting.[Ref]


Common (1% to 10%): Diarrhea, nausea, vomiting

Frequency not reported: Increased fecal fat, increased salivation, steatorrhea, stomatitis[Ref]


Metabolic syndrome occurred with prolonged therapy, and included increased fecal fat, steatorrhea, decreased serum carotene, and a fall in xylose absorption. Steatorrhea and diarrhea occurring during metabolic syndrome can be very severe.[Ref]

Frequency not reported: Decreased serum carotene, electrolyte disturbances, fall in xylose absorption, hypocalcemia, hypokalemia, hypomagnesemia, malabsorption syndrome[Ref]

Nervous system

Frequency not reported: Neuromuscular blockade/blockage, neurotoxicity, nystagmus, paresthesia, vestibular toxicity[Ref]


Frequency not reported: Drug fever, ototoxicity, permanent bilateral ototoxicity[Ref]


Frequency not reported: Anaphylaxis, cross-sensitivity, hypersensitivity reactions[Ref]


Frequency not reported: Increased bilirubin levels, increased hepatic enzyme levels[Ref]


Frequency not reported: Blood dyscrasias, hemolytic anemia[Ref]


Frequency not reported: Confusion, disorientation[Ref]


Frequency not reported: Dermatitis, pruritus[Ref]


Frequency not reported: Nephrotoxicity[Ref]


Frequency not reported: Superinfection[Ref]

Superinfection occurred with prolonged therapy.[Ref]


Frequency not reported: Respiratory paralysis[Ref]

Frequently asked questions

More about Mycifradin (neomycin)

Patient resources

Other brands


Professional resources

Related treatment guides


1. "Product Information. Mycifradin (neomycin)." Emerson Laboratories (2001):

2. "Product Information. Neomycin (neomycin)." Pharma-Tek (2001):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.