IV Iron Infusions for Anemia From Heavy Periods: Questions to Ask

Heavy periods in perimenopause can drain your iron stores, leaving you tired, breathless or dizzy. The National Heart¹, Lung, and Blood Institute (NHLBI) lists heavy menstrual periods as a common cause of iron-deficiency anemia.¹ Iron pills are the usual first treatment, but they take months and can be hard on the stomach. Here is what to know if your clinician suggests an infusion instead.

Pills vs. infusion

• Iron pills are the most common treatment and often take three to six months to restore iron levels. Side effects can include a metallic taste, nausea, diarrhea, constipation and upset stomach.¹ Our article on iron pills for heavy periods covers that option.
• IV iron goes directly into a vein and often restores iron levels in one or a few sessions. It’s more likely to be used for serious anemia or long-term conditions.¹ One common IV iron is approved for people who can’t tolerate iron pills or didn’t respond to them.²

What to expect at the visit

The infusion is given in a clinic or infusion center. The label for one common IV iron calls for watching patients for allergic reactions for at least 30 minutes after each dose, and monitoring for high blood pressure.² NHLBI notes side effects such as vomiting or headache right after treatment, which usually go away in a day or two.¹

The phosphate warning

In August 2026, the label for ferric carboxymaltose, one widely used IV iron, added a boxed warning. It says the drug can cause severe, prolonged low phosphate levels, sometimes leading to hospitalization, softened bones and fractures. This has happened even in people with normal phosphate levels and no obvious risk factors.²

The label advises:

• Checking phosphate before a repeat course in people at risk, or if another course is given within three months.²
• Reporting symptoms such as fatigue, muscle weakness or pain, and bone or joint pain.²

Risk factors listed include inflammatory bowel disease, conditions that affect absorption, vitamin D deficiency and certain other medical conditions.² Other IV iron products are available, so ask which one you’ll receive and why.

Questions to ask

1. Which IV iron will I get, and what are its risks?
2. Should my phosphate and vitamin D be checked before or after treatment?
3. How many infusions will I need, and what will insurance cover?
4. What’s the plan for the bleeding? Iron refills the tank, but it doesn’t stop heavy periods.

Treating the cause

Heavy bleeding in your 40s and 50s can come from fibroids, polyps, hormone changes or other causes, and some need checking. See our guides to how heavy is too heavy and tranexamic acid.

Try: “My iron is low and pills upset my stomach. Would an infusion help, which type would you use, and what can we do about my heavy periods?”

Period, Handled includes a Period Scorecard and a visit script. Use them to track your bleeding, symptoms and iron results, and bring them to your appointment. See the book.