Acid Nalidixic


Generic Name: Acid Nalidixic Brand Name(s): Generics only. No brands available.


What is acid nalidixic used for?

Acid nalidixic is commonly used for treating urinary tract infections caused by certain bacteria.

How should I take acid nalidixic?

To take acid nalidixic, you should:

  • Take nalidixic acid with or without food. If stomach upset occurs, take with food to reduce stomach irritation.
  • Drink a full glass of water with each dose. Drink several additional glasses of water daily unless otherwise directed by your doctor. Do not drink products with caffeine while taking nalidixic acid.
  • If you are uncertain about any of the information, consult your doctor or pharmacist.

How do I store acid nalidixic?

Acid nalidixic is best stored at room temperature away from direct light and moisture. To prevent drug damage, you should not store acid nalidixic in the bathroom or the freezer. There may be different brands of acid nalidixic that may have different storage needs. It is important to always check the product package for instructions on storage, or ask your pharmacist. For safety, you should keep all medicines away from children and pets.                             You should not flush acid nalidixic down the toilet or pour them into a drain unless instructed to do so. It is important to properly discard this product when it is expired or no longer needed. Consult your pharmacist for more details about how to safely discard your product.

Precautions & warnings

What should I know before using acid nalidixic?

Do not use nalidixic acid if:

  • You are allergic to any ingredient in nalidixic acid.
  • You are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement.
  • You have allergies to medicines, foods, or other substances.

Before using this drug, you should know that:

  • Long-term or repeated use of nalidixic acid may cause a second infection. Tell your doctor if signs of a second infection occur. Your medicine may need to be changed to treat this.
  • Lab tests, including liver function, kidney function, and complete blood cell counts, may be performed while you use nalidixic acid. These tests may be used to monitor your condition or check for side effects. Be sure to keep all doctor and lab appointments.

Is it safe during pregnancy or breastfeeding?

There are no adequate studies in women for determining risk when using metronidazole during pregnancy or while breastfeeding. Please always consult with your doctor to weigh the potential benefits and risks before taking metronidazole. Metronidazole is pregnancy risk category B, according to the US Food and Drug Administration (FDA).

FDA pregnancy risk category reference below:

  • A=No risk
  • B=No risk in some studies
  • C=There may be some risk
  • D=Positive evidence of risk
  • X=Contraindicated
  • N=Unknown

Side effects

What side effects can occur from acid nalidixic?

Some side effects are:

  • Diarrhea
  • Dizziness
  • Drowsiness
  • Feeling of a whirling motion
  • Headache
  • Nausea
  • Rash
  • Stomach pain or discomfort
  • Vomiting
  • Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue)
  • Blurred or decreased vision
  • Burning or tingling sensation
  • Changes in color vision
  • Convulsions
  • Decrease in ability to sense pain, temperature, or body position
  • Double vision
  • Itching
  • Numbness
  • Pain, redness, or swelling of a tendon
  • Seeing halos around lights
  • Weakness

Not everyone experiences these side effects. There may be some side effects not listed above. If you have any concerns about a side-effect, please consult your doctor or pharmacist.


What drugs may interact with acid nalidixic?

Nalidixic acid may interact with other drugs that you are currently taking, which can change how your drug works or increase your risk for serious side effects. To avoid any potential drug interactions, you should keep a list of all the drugs you are using (including prescription drugs, nonprescription drugs, and herbal products) and share it with your doctor and pharmacist. For your safety, do not start, stop, or change the dosage of any drugs without your doctor’s approval.

Products may interact with this drug, including:

  • Anticoagulants (e.g., warfarin)
  • Antiarrhythmic (e.g., quinidine, procainamide, amiodarone, sotalol)
  • Certain medicines that affect heartbeat (e.g., cisapride, erythromycin, amitriptyline)
  • Cyclosporine
  • Melphalan
  • Theophylline
  • Probenecid

Does food or alcohol interact with acid nalidixic?

Acid nalidixic may interact with food or alcohol by altering the way the drug works or increase the risk for serious side effects. Please discuss with your doctor or pharmacist any potential food or alcohol interactions before using this drug.

What health conditions may interact with acid nalidixic?

Acid nalidixic may interact with your health condition. This interaction may worsen your health condition or alter the way the drug works. It is important to always let your doctor and pharmacist know all the health conditions you currently have.

These health conditions include:

  • Alzheimer disease
  • A central nervous system disease
  • Hardening of the arteries in your brain
  • Increased pressure in your brain
  • Liver problems
  • Sensitivity to the sun
  • Severe kidney problems
  • A family history of heartbeat problems
  • Blood disease porphyria
  • A history of convulsions
  • Undergoing cancer chemotherapy
  • Diabetes


The information provided is not a substitute for any medical advice. You should ALWAYS consult with your doctor or pharmacist before using acid nalidixic.

What is the dose of acid nalidixic for an adult?

The recommended dosage for initial therapy in adults is 1 g administered four times daily for one or two weeks (total daily dose, 4 g).

For prolonged therapy, the total daily dose may be reduced to 2 g after the initial treatment period. Underdosage during initial treatment may predispose to emergence of bacterial resistance.

What is the dose of acid nalidixic for a child?

The dosage has not been established in pediatric patients who are younger than 18 years old. It may be unsafe for your child. It is always important to fully understand the safety of the drug before using. Please consult with your doctor or pharmacist for more information.

How is acid nalidixic available?

Acid nalidixic is available in the following dosage forms and strengths:

  • tablet 500mg

What should I do in case of an emergency or overdose?

In case of an emergency or an overdose, call your local emergency services or go to your nearest emergency room.

What should I do if I miss a dose?

If you miss a dose of acid nalidixic, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and take your regular dose as scheduled. Do not take a double dose.

Hello Health Group does not provide medical advice, diagnosis or treatment.


Review Date: January 20, 2017 | Last Modified: February 6, 2017

You might also like