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Nydrazid Inj

In Depth

Generic Name: ISONIAZID - INJECTION
Pronounced: (eye-so-NYE-uh-zid)

Nydrazid Inj Warning

Rarely, isoniazid has caused a severe (sometimes fatal) liver problem (hepatitis). Hepatitis can develop at any time while you are using this medication. Immediately tell your doctor if you develop symptoms of liver problems (persistent nausea, vomiting, weakness, tiredness, stomach/abdominal pain, dark urine, yellowing eyes/skin). The risk of hepatitis increases with age (35 and older), persistent liver problems, and the use of alcohol and/or illegal injection drugs. Do not use alcohol or illegal injection drugs while using this medication.

You will need certain blood tests (liver function tests) regularly to check for side effects. Keep all medical and laboratory appointments.

Nydrazid Inj Side Effects

See also Warning section.

Pain/redness at the injection site, and tingling/numbness in the hands/feet may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur:

  • increase in the amount of urine
  • breast enlargement in males


Tell your doctor immediately if any of these rare but very serious side effects occur:

  • vision changes
  • confusion
  • seizures
  • sudden weakness
  • pale skin
  • fast breathing
  • easy bruising/bleeding
  • signs of a different/serious infection (e.g., new fever, persistent sore throat, chills)


This medication may rarely cause a serious immune system problem (systemic lupus erythematosus). Tell your doctor immediately if you experience any of these unlikely but serious side effects:

  • unusual tiredness
  • joint/muscle aches
  • unusual fever
  • butterfly-shaped facial rash
  • swollen glands
  • bloody/pink urine
  • swelling of the feet/ankles


Your doctor may need to order special tests if you experience these symptoms. Keep all laboratory and medical appointments.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

  • rash
  • itching
  • swelling
  • severe dizziness
  • trouble breathing


This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

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