Acetohydroxamic acid Side Effects

Not all side effects for acetohydroxamic acid may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to acetohydroxamic acid: oral tablet

Get emergency medical help if you have any of these signs of an allergic reaction while taking acetohydroxamic acid: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

  • chest pain, fast or pounding heartbeats;

  • pale or yellowed skin, dark colored urine, fever, confusion or weakness;

  • mood changes, confusion, anxiety;

  • tremors or shaking;

  • easy bruising or bleeding;

  • sore throat, body aches, flu symptoms; or

  • pain or swelling in one or both legs.

Less serious side effects of acetohydroxamic acid may include:

  • mild nausea, vomiting, upset stomach;

  • loss of appetite;

  • headache; or

  • hair loss.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.

For Healthcare Professionals

Applies to acetohydroxamic acid: oral tablet


In most patients the symptoms were mild, transitory, and did not result in interruption of treatment.

Gastrointestinal side effects including nausea, vomiting, anorexia, and malaise have been reported in 20% to 25% of patients.


In most patients the symptoms were mild and transitory, but in about 6% of patients the symptoms were sufficiently distressing to warrant interruption or discontinuation of treatment.

Psychiatric side effects including depression, anxiety, nervousness, and tremulousness have been observed in approximately 20% of patients.


Hematologic side effects including hemolytic anemia (15%) have been reported. Approximately 3% of patients developed a hemolytic anemia of sufficient magnitude to warrant interruption in treatment. A mild reticulocytosis (5% to 6%) without anemia, has also been reported.

The laboratory findings are occasionally accompanied by systemic symptoms such as malaise, lethargy and fatigue, and gastrointestinal symptoms. Symptoms and laboratory findings have invariably improved following cessation of treatment with acetohydroxamic acid. The hematological abnormalities are more prevalent in patients with advanced renal failure.

Nervous system

These headaches are mild, responsive to oral salicylate-type analgesics, and usually disappear spontaneously. The headaches have not been associated with vertigo, tinnitus, or visual or auditory abnormalities.

Nervous system side effects have included mild headaches during the first 48 hours of treatment. Tremulousness and nervousness have also been reported.


The macular skin rash has usually occurred when acetohydroxamic acid has been taken concomitantly with alcoholic beverages, but in a few patients in the absence of alcohol consumption. The rash commonly appeared 30 to 45 minutes after ingestion of alcoholic beverages; it characteristically disappeared spontaneously in 30 to 60 minutes. The rash may be associated with a general sensation of warmth. In some patients the rash is sufficiently severe to warrant discontinuation of treatment, but most patients have continued treatment, avoiding alcohol or using smaller quantities of it.

A macular skin rash has occurred in the upper extremities and on the face of several patients taking acetohydroxamic acid on a long-term basis. Alopecia has also been reported.


Several of the affected patients had phlebitic episodes prior to treatment.

The patient with phlebothrombosis had an associated traumatic injury to the groin. It is unclear whether the phlebitis was related to or exacerbated by treatment with acetohydroxamic acid. No patient in the three year controlled (Phase III) clinical trial developed phlebitis. In all instances these vascular abnormalities returned to normal following appropriate medical therapy.

The phlebitis and emboli resolved following discontinuation of acetohydroxamic acid and implementation of appropriate medical therapy. Several patients have resumed treatment with acetohydroxamic acid without ill effect.

Cardiovascular side effects including superficial phlebitis involving the lower extremities has been reported in several patients on acetohydroxamic acid during clinical trials. Palpitations have also been reported. Embolic phenomena have been reported in three patients taking acetohydroxamic acid in the Phase II trial. One patient developed deep vein thrombosis of the lower extremities.

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