Medical Editor: John P. Cunha, DO, FACOEP Last updated on RxList: 8/31/2022

Drug Summary

What Is Niferex-150?

Niferex-150 Capsules (ferrous asparto glycinate and polysaccharide iron) Complex is a dietary supplement used to treat and prevent vitamin C and iron deficiencies. Niferex-150 is available in generic form.

What Are Side Effects of Niferex-150?

Common side effects of Niferex-150 include:

  • stomach upset,
  • nausea,
  • vomiting,
  • diarrhea,
  • constipation,
  • staining of the teeth, and
  • black-colored stools

Seek medical care or call 911 at once if you have the following serious side effects:

  • Serious eye symptoms such as sudden vision loss, blurred vision, tunnel vision, eye pain or swelling, or seeing halos around lights;
  • Serious heart symptoms such as fast, irregular, or pounding heartbeats; fluttering in your chest; shortness of breath; and sudden dizziness, lightheartedness, or passing out;
  • Severe headache, confusion, slurred speech, arm or leg weakness, trouble walking, loss of coordination, feeling unsteady, very stiff muscles, high fever, profuse sweating, or tremors.

This document does not contain all possible side effects and others may occur. Check with your physician for additional information about side effects.

Dosage for Niferex-150

The recommended dose of Niferex-150 is 1 or 2 capsules daily.

What Drugs, Substances, or Supplements Interact with Niferex-150?

Warfarin, estrogen, and birth control may interact with Niferex-150. Tell your doctor all medications you take. Keep Niferex-150 out of reach of children.

Niferex-150 During Pregnancy or Breastfeeding

If you are pregnant or breastfeeding, talk to your doctor before taking Niferex-150.

Additional Information

Our Niferex-150 Capsules (ferrous asparto glycinate and polysaccharide iron) Complex Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

Drug Description


Supplement Facts
Serving Size 1 Capsule

Amount Per Serving % Daily Value
Iron (elemental)
(33% as Sumalate™† and 67% as polysaccharide iron complex)
150 mg 833%
Vitamin C from Ester-C ®
(81% and 1% of Ester-C ® as ascorbic acid and threonic acid)
50 mg 56%
Succinic acid 50 mg *
* Daily Value not established

Other ingredients: Malic acid, magnesium stearate, silicon dioxide, gelatin, titanium dioxide, D&C Yellow No. 10, D&C Red No. 28, FD&C Red No. 40, FD&C Blue No.1, and pharmaceutical glaze.

† Sumalate" (ferrous asparto glycinate) is a trademark of Albion International, Inc., Clearfield, Utah. U.S. Patent Pending.

‡ Ester-C® is a patented pharmaceutical grade material consisting of calcium ascorbate and calcium threonate. Ester-C® is a licensed trademark of Zila Nutraceuticals, Inc.

Indications & Dosage


No information provided.


Directions: Adults take 1 or 2 capsules daily, or as directed by a physician.


NDC 64011-163-26 - 90 Capsules

Store at controlled room temperature 15°-30° C (59°-86°F).

Mktd. by Ther-Rx Corp., St. Louis, MO 63044. 05/06

Side Effects & Drug Interactions


No information provided.


No information provided.

Warnings & Precautions


Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6. Keep this product out of reach of children. In case of accidental overdose, call a doctor or poison control center immediately.

Iron is best absorbed on an empty stomach; however, occasional gastrointestional discomfort (such as nausea) may be minimized by taking with meals. Iron-containing medication may occasionally cause black stools, constipation, or diarrhea, which is usually transient and self-limiting.

If pregnant or breast-feeding, ask a health professional before use.

This package is tamper evident. Do not use if imprinted seal under cap is missing or damaged.


No information provided.

Overdose & Contraindications


No information provided.


No information provided.

Clinical Pharmacology


No information provided.

Medication Guide


No information provided. Please refer to the WARNINGS section.

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