Ferrous Sulfate Ingredients & Drug Interactions
What is this page for?
First and foremost: checking Ferrous Sulfate against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.
Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy
Ferrous Sulfate is a dietary supplement by Puritan's Pride with 1 active ingredient. Its ingredients are commonly taken for iron-deficiency anemia, low iron stores during pregnancy, fatigue from iron deficiency.Based on those ingredients, 80 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Iron. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.
Check Your Meds Against Ferrous Sulfate by Puritan's Pride
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AI summaries are generated from our interaction database for education only — always confirm with your pharmacist. How we use AI
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HelloPharmacist Scorecard of Ferrous Sulfate by Puritan's Pride
Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.
What’s inside
Full disclosure
Ferrous Sulfate contains one active ingredient: iron. Iron is an essential mineral your body uses to make hemoglobin, the protein in red blood cells that carries oxygen to your tissues.
The tablet also contains inactive ingredients — calcium carbonate, dicalcium phosphate, vegetable cellulose, and vegetable magnesium stearate — which are fillers and binders that hold the tablet together.
Does it work?
Strong evidence
Iron supplements are effective for iron deficiency anemia and anemia of chronic disease, conditions where your body either doesn't have enough iron or can't use it well. The data also shows iron is effective for pregnancy-related iron deficiency.
For heart failure, the evidence suggests it may help, but the data isn't as solid. Work with your doctor to confirm you actually need iron before starting — unnecessary supplementation can be harmful.
How safe is it?
Well-documented data
Iron is generally well tolerated at recommended doses, but excess iron is toxic and supplements should only be used when there's a real need. The most common side effects taken by mouth are abdominal pain, constipation, diarrhea, stomach irritation, nausea, and vomiting.
Rarely, case reports have noted concerns about stomach or gastric ulcers with oral iron. Iron is often recommended in pregnancy and is considered acceptable while breastfeeding at appropriate doses, but your prenatal care provider or your own doctor should guide the dose you take.
There is some debate in research about whether high iron stores are linked to heart attack or coronary heart disease, but most studies have found no connection. Long-term use without follow-up has been associated with acquired hemochromatosis (iron overload) in rare cases.
Meds to double-check
Moderate interaction found
Before you start ferrous sulfate, check with your doctor or pharmacist if you take levodopa (Parkinson's medication), any quinolone or tetracycline antibiotics, bisphosphonates, levothyroxine (thyroid hormone), methyldopa, mycophenolate mofetil, or penicillamine. Iron significantly reduces how well your body absorbs all of these, and you'll need to separate doses by at least 2 hours — or up to 6 hours for some.
The bottom line
Scorecard at a glanceFully disclosed formula with clinical evidence supporting its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.
Ferrous Sulfate is effective for iron deficiency anemia, chronic anemia, and iron deficiency in pregnancy — but only use it if you truly need it, because too much iron can cause harm. If you take levodopa, any antibiotic, a thyroid medication, a blood pressure drug, or certain immunosuppressants or bone medications, you'll need to space out your doses carefully.
Talk with your doctor or pharmacist about whether this supplement is right for you and how to time it with your other medications.
Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI
Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Feb 21, 2023.
This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed
General information
Key facts about Ferrous Sulfate, straight from the product label.
| Brand | Puritan's Pride |
|---|---|
| Barcode (UPC) | 074312117909 |
| Net contents | 100 Tablet(s) |
| Market status | On market |
| Date entered into DSLD | Feb 21, 2023 |
| DSLD ID | 285015 |
| Product type | Mineral |
| Supplement form | Tablet Or Pill |
| Dietary claims / uses | Nutrient, All Other |
| Intended target group(s) | Vegetarian, Adult (18 - 50 Years), Gluten Free, Dairy Free, Sugar Free |
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.
Supplement Facts
The label details for Ferrous Sulfate by Puritan's Pride, sourced from the NIH Dietary Supplement Label Database.
Supplement Facts
| Ingredient | Amount | % DV |
|---|---|---|
| Iron | 28 mg | 156% |
Other ingredients: Calcium Carbonate, Dicalcium Phosphate, Vegetable Cellulose, Vegetable Magnesium Stearate
Tap any ingredient to jump to its full detail below.
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
General Statements
Puritan’s Pride supplements are produced from the finest raw materials under stringent quality control standards. State-of-the-art manufacturing and packaging facilities ensure you the highest quality nutritional supplements money can buy. When it comes to your health...choose the best.
To reorder item # 1790 www.puritan.com 1-800-645-1030
Precautions
Warning: If you are pregnant, nursing, taking any medications or have any medical condition, consult your doctor before use.
Discontinue use and consult your doctor if any adverse reactions occur.
Do not use if seal under cap is broken or missing.
Warning: Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under six. Keep this product out of reach of children. In case of accidental overdose, call a doctor or Poison Control Center immediately.
Storage
Store at room temperature.
Brand IP Statement(s)
Copyright 2019 Puritan’s Pride, Inc
Seals/Symbols
QA Quality Assured
Formula
28 mg Iron
Formulation
Vegetarian
Color of product changes over time but does not affect the potency of the product.
No artificial color, flavor or sweetener, no sugar, no starch, no milk, no lactose, no soy, no gluten, no wheat, no yeast, no fish. Sodium free.
FDA Statement of Identity
Iron Supplement
Suggested/Recommended/Usage/Directions
Directions: For adults, take one (1) tablet daily, preferably with a meal.
Is this label outdated? Report a formula or label change and our pharmacy team will review it.
Ferrous Sulfate by Puritan's Pride label
The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.
Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.
View the full label (PDF)The Ingredients in Ferrous Sulfate by Puritan's Pride
This is the 1 active ingredient this product is made of. Select it to open its full monograph.
Serving size1 Tablet(s) Dosage formTablet Or Pill Servings per container100 Amounts shown are per serving.
Iron
Interacts with80 drugs
Iron is an essential mineral your body needs to make hemoglobin and carry oxygen in the blood. Supplements are mainly useful for treating or preventin...
Iron monograph & interactionsOther (inactive) ingredients: Calcium Carbonate, Dicalcium Phosphate, Vegetable Cellulose, Vegetable Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.
Ferrous Sulfate by Puritan's Pride Drug Interactions
HelloPharmacist Interaction Report
Ferrous Sulfate by Puritan's Pride interacts with medications through its iron content, and the most serious concern is with levodopa, a medication for Parkinson's disease — iron can cut levodopa levels roughly in half by blocking how your body absorbs it.
Altogether, these interactions span 80 individual medications.
Read the full breakdown — every affected drug type, severity by severity
Iron reduces how well your body absorbs several other drugs. Quinolone antibiotics (like ciprofloxacin), tetracycline antibiotics, and bisphosphonates (used for bone health) all form insoluble complexes with iron in your stomach and intestines, cutting their effectiveness by 30% to 90%.
The same goes for levothyroxine (thyroid hormone), methyldopa (a blood pressure medication), mycophenolate mofetil (an immunosuppressant), and penicillamine (used for Wilson's disease and heavy metal poisoning). All of these are rated Moderate severity.
The fix for most of these is timing. Separate iron doses by at least 2 hours from levodopa, quinolone and tetracycline antibiotics, methyldopa, levothyroxine, and penicillamine.
For bisphosphonates and mycophenolate mofetil, aim for a bigger gap — 4 to 6 hours. Use the medication checker on this page to look up your exact prescriptions before you start.
Check your own medications below · Editorial policy · How we use AI
Want to check YOUR meds against Ferrous Sulfate?
Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.
Go to the checkerIngredients driving the most interactions
Individual Drug Interactions
The ingredients in Ferrous Sulfate interact with 80 drugs. Click any drug to see the details.
1 of the 1 ingredient in Ferrous Sulfate interact with drugs. Each result below shows which ingredient is responsible. Iron
Emtricitabine, Tenofovir Alafenamide FumarateDescovy
How Emtricitabine, Tenofovir Alafenamide Fumarate interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronBictegravir/emtricitabine/tenofovir Alafenamide (biktarvy) Moderate
Interaction Summary
Iron might decrease levels of bictegravir/emtricitabine/tenofovir alafenamide by reducing its absorption when taken in a fasting state.
Read the full Iron + Emtricitabine, Tenofovir Alafenamide Fumarate interactionEnoxacinPenetrex
How Enoxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Enoxacin interactionEravacyclineXerava
How Eravacycline interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronTetracycline Antibiotics Moderate
Interaction Summary
Iron might decrease levels of tetracycline antibiotics by reducing their absorption.
Read the full Iron + Eravacycline interactionEtidronate DisodiumDidrocal, Didronel
How Etidronate Disodium interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronBisphosphonates Moderate
Interaction Summary
Iron reduces the absorption of bisphosphonates.
Read the full Iron + Etidronate Disodium interactionFinafloxacinXtoro
How Finafloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Finafloxacin interactionGatifloxacinTequin, Tequin Injection
How Gatifloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Gatifloxacin interactionGemifloxacinFactive
How Gemifloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Gemifloxacin interactionGrepafloxacinRaxar
How Grepafloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Grepafloxacin interactionHydrochlorothiazide, MethyldopaAldoril 15, Aldoril 25, Aldoril D30, Methazide
How Hydrochlorothiazide, Methyldopa interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronMethyldopa (aldomet) Moderate
Interaction Summary
Iron might decrease methyldopa levels by reducing its absorption.
Read the full Iron + Hydrochlorothiazide, Methyldopa interactionIbandronateBoniva, Boniva IV
How Ibandronate interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronBisphosphonates Moderate
Interaction Summary
Iron reduces the absorption of bisphosphonates.
Read the full Iron + Ibandronate interactionLamivudine, RaltegravirDutrebis
How Lamivudine, Raltegravir interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronIntegrase Inhibitors Moderate
Interaction Summary
Theoretically, taking iron along with integrase inhibitors might decrease the levels and clinical effects of these drugs.
Read the full Iron + Lamivudine, Raltegravir interactionLamivudine, Tenofovir Disoproxil FumarateTemixys
How Lamivudine, Tenofovir Disoproxil Fumarate interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronBictegravir/emtricitabine/tenofovir Alafenamide (biktarvy) Moderate
Interaction Summary
Iron might decrease levels of bictegravir/emtricitabine/tenofovir alafenamide by reducing its absorption when taken in a fasting state.
Read the full Iron + Lamivudine, Tenofovir Disoproxil Fumarate interactionLevodopaInbrija, Larodopa
How Levodopa interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronLevodopa Moderate
Interaction Summary
Iron might decrease levodopa levels by reducing its absorption.
Read the full Iron + Levodopa interactionLevodopa, CarbidopaDuodopa
How Levodopa, Carbidopa interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronLevodopa Moderate
Interaction Summary
Iron might decrease levodopa levels by reducing its absorption.
Read the full Iron + Levodopa, Carbidopa interactionLevofloxacinLeva-pak, Levaquin, Levaquin Injection
How Levofloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Levofloxacin interactionLevofloxacin (ophthalmic)Levofloxacin
How Levofloxacin (ophthalmic) interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Levofloxacin (ophthalmic) interactionLevothyroxineEltroxin, Estre, Euthyrox, Levo-T, Levolet, Levothroid +5 more
How Levothyroxine interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronLevothyroxine (synthroid, Others) Moderate
Interaction Summary
Iron might decrease levothyroxine levels by reducing its absorption.
Read the full Iron + Levothyroxine interactionLevothyroxine SodiumErmez, Thyquidity, Tirosint-Sol
How Levothyroxine Sodium interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronLevothyroxine (synthroid, Others) Moderate
Interaction Summary
Iron might decrease levothyroxine levels by reducing its absorption.
Read the full Iron + Levothyroxine Sodium interactionLevothyroxine, LiothyronineArmour Thyroid
How Levothyroxine, Liothyronine interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronLevothyroxine (synthroid, Others) Moderate
Interaction Summary
Iron might decrease levothyroxine levels by reducing its absorption.
Read the full Iron + Levothyroxine, Liothyronine interactionLomefloxacinMaxaquin
How Lomefloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Lomefloxacin interactionMethyldopaAldomet, Methyldopa
How Methyldopa interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronMethyldopa (aldomet) Moderate
Interaction Summary
Iron might decrease methyldopa levels by reducing its absorption.
Read the full Iron + Methyldopa interactionMetronidazole, Tetracyline, Bismuth Subcitrate PotassiumPylera
How Metronidazole, Tetracyline, Bismuth Subcitrate Potassium interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronTetracycline Antibiotics Moderate
Interaction Summary
Iron might decrease levels of tetracycline antibiotics by reducing their absorption.
Read the full Iron + Metronidazole, Tetracyline, Bismuth Subcitrate Potassium interactionMinocyclineAcnamino MR, Aknemin, Amzeeq, Arestin Miscrosperes, Dynacin, Minocin +6 more
How Minocycline interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronTetracycline Antibiotics Moderate
Interaction Summary
Iron might decrease levels of tetracycline antibiotics by reducing their absorption.
Read the full Iron + Minocycline interactionMinocycline HydrochlorideMinolira, Ximino
How Minocycline Hydrochloride interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronTetracycline Antibiotics Moderate
Interaction Summary
Iron might decrease levels of tetracycline antibiotics by reducing their absorption.
Read the full Iron + Minocycline Hydrochloride interactionMoxifloxacinAvelox
How Moxifloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Moxifloxacin interactionMycophenolate MofetilCellCept
How Mycophenolate Mofetil interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronMycophenolate Mofetil (cellcept) Moderate
Interaction Summary
Theoretically, iron might decrease mycophenolate mofetil levels by reducing its absorption.
Read the full Iron + Mycophenolate Mofetil interactionNalidixic AcidNegGram
How Nalidixic Acid interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Nalidixic Acid interactionNorfloxacinNorflox, Noroxin
How Norfloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Norfloxacin interactionOfloxacinFloxin, Floxin Injection, Floxin Otic, Oflox
How Ofloxacin interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronQuinolone Antibiotics Moderate
Interaction Summary
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Read the full Iron + Ofloxacin interactionOmadacycline (iv)Nuzyra
How Omadacycline (iv) interacts with Ferrous Sulfate — through 1 ingredient. Tap an ingredient for the detail:
IronTetracycline Antibiotics Moderate
Interaction Summary
Iron might decrease levels of tetracycline antibiotics by reducing their absorption.
Read the full Iron + Omadacycline (iv) interactionEach ingredient & the kinds of drugs it affects
For each ingredient in Ferrous Sulfate with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.
Iron
Bictegravir/Emtricitabine/Tenofovir Alafenamide (Biktarvy)
Iron might decrease levels of bictegravir/emtricitabine/tenofovir alafenamide by reducing its absorption when taken in a fasting state.
Advise patients that bictegravir/emtricitabine/tenofovir alafenamide and iron can be taken together if taken with food. However, if taken on an empty stomach, bictegravir/emtricitabine/tenofovir alafenamide should not be taken with, or 2 hours after, iron containing products.
Bisphosphonates
Iron reduces the absorption of bisphosphonates.
Advise patients that doses of bisphosphonates should be separated by at least two hours from doses of all other medications, including supplements such as iron. Divalent cations, including iron, can decrease absorption of bisphosphonates by forming insoluble complexes in the gastrointestinal tract.
Denosumab (Prolia, Others)
Administration of intravenous iron within one month of denosumab administration might increase the risk of severe hypophosphatemia and hypocalcemia.
A case of severe hypocalcemia (albumin corrected calcium 6.88 mg/dL, ionized calcium 3.68 mg/dL) and hypophosphatemia (<0.5 mg/dL) with respiratory acidosis, QT interval prolongation, and nonsustained ventricular tachycardia was reported in a 76-year-old male who had received an iron polymaltose infusion within 2 weeks of a subcutaneous injection of denosumab. Serum parathyroid hormone was also elevated (348 pg/mL). Subsequent iron infusions with iron polymaltose and ferric carboxymaltose were followed by transient hypophosphatemia, but without hypocalcemia. Additionally, a literature review describes 6 additional cases of hypophosphatemia and hypocalcemia in patients 52-92 years of age who had been administered intravenous iron as either ferric carboxymaltose or iron polymaltose and subcutaneous denosumab within 1-4 weeks of each other.
Dolutegravir (Tivicay)
Iron might decrease dolutegravir levels by reducing its absorption.
Advise patients to take dolutegravir at least 2 hours before or 6 hours after taking iron. Pharmacokinetic research shows that iron can decrease the absorption of dolutegravir from the gastrointestinal tract through chelation. When taken under fasting conditions, a single dose of ferrous fumarate 324 mg orally along with dolutegravir 50 mg reduces overall exposure to dolutegravir by 54%.
Integrase Inhibitors
Theoretically, taking iron along with integrase inhibitors might decrease the levels and clinical effects of these drugs.
Iron is a divalent cation. There is concern that iron may decrease the absorption of integrase inhibitors from the gastrointestinal tract through chelation. One pharmacokinetic study shows that iron can decrease blood levels of the specific integrase inhibitor dolutegravir through chelation. Also, other pharmacokinetic research shows that other divalent cations such as calcium can decrease the absorption and levels of some integrase inhibitors through chelation.
Levodopa
Iron might decrease levodopa levels by reducing its absorption.
Advise patients to separate doses of levodopa and iron as much as possible. There is some evidence in healthy people that iron forms chelates with levodopa, reducing the amount of levodopa absorbed by around 50%. The clinical significance of this hasn't been determined.
Levothyroxine (Synthroid, Others)
Iron might decrease levothyroxine levels by reducing its absorption.
Advise patients to separate levothyroxine and iron doses by at least 2 hours. Iron can decrease the absorption and efficacy of levothyroxine by forming insoluble complexes in the gastrointestinal tract.
Methyldopa (Aldomet)
Iron might decrease methyldopa levels by reducing its absorption.
Advise patients to separate methyldopa and iron doses by at least 2 hours. Iron can decrease the absorption of methyldopa from the gastrointestinal tract through chelation, resulting in increases in blood pressure.
Mycophenolate Mofetil (Cellcept)
Theoretically, iron might decrease mycophenolate mofetil levels by reducing its absorption.
Advise patients to take iron 4-6 hours before, or 2 hours after, mycophenolate mofetil. It has been suggested that a decrease of absorption is possible, probably by forming nonabsorbable chelates. However, mycophenolate pharmacokinetics are not affected by iron supplementation in available clinical research.
Penicillamine (Cuprimine, Depen)
Iron might decrease penicillamine levels by reducing its absorption.
Advise patients to separate penicillamine and iron doses by at least 2 hours. Oral iron supplements can reduce absorption of penicillamine by 30% to 70%, probably due to chelate formation. In people with Wilson's disease, this interaction has led to reduced efficacy of penicillamine.
Quinolone Antibiotics
Iron might decrease levels of quinolone antibiotics by reducing their absorption.
Advise patients to separate quinolone antibiotics and iron doses by at least 2 hours. Iron decreases the absorption of quinolones due to formation of insoluble complexes in the gastrointestinal tract.
Tetracycline Antibiotics
Iron might decrease levels of tetracycline antibiotics by reducing their absorption.
Advise patients to take iron at least 2 hours before or 4 hours after tetracycline antibiotics. Concomitant use can decrease absorption of tetracycline antibiotics from the gastrointestinal tract by 50% to 90%.
Chloramphenicol
Theoretically, taking chloramphenicol with iron might reduce the response to iron therapy in iron deficiency anemia.
Chloramphenicol interferes with erythrocyte maturation. However, since chloramphenicol isn't usually taken for prolonged periods, this isn't likely to be clinically significant.
Brand information
Manufacturer and brand details for Ferrous Sulfate, from the product label.
Puritan's Pride
See all Puritan's Pride products- Name
- Puritan's Pride, Inc.
- City
- Ronkonkoma
- State
- NY
- ZipCode
- 11779
- Phone Number
- 1-800-645-1030
- Web Address
- www.puritan.com
Ferrous Sulfate by Puritan's Pride: Common Questions
Does Ferrous Sulfate by Puritan's Pride interact with any medications?
How can one product interact with so many drugs?
Where does this information come from?
Is iron safe to take during pregnancy?
Can I take this while breastfeeding?
What's the most common side effect?
Does this really work for anemia?
Can I take iron with all my other medications?
Is there anything in this besides iron?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
Not sure if Ferrous Sulfate is safe with your meds?
Our pharmacists answer your medication & supplement questions — free.
Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.
The Full Monographs Behind Ferrous Sulfate’s Ingredients
Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.
Sources & How We Checked
Ferrous Sulfate's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.
- NIH Dietary Supplement Label Database (DSLD) — The official product label on file for this supplement.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference behind the ingredient interaction data.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
The 72 references behind this product’s interaction data
Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.
Iron 72 references
- McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
- Bruner AB, Joffe A, Duggan AK, et al. Randomized study of cognitive effects of iron supplementation in non- anaemic iron-deficient adolescent girls. Lancet 1996;348:992-6.
- Ullen H, Augustsson K, Gustavsson C, Steineck G. Supplementary iron intake and risk of cancer: reversed causality? Cancer Lett 1997;114:215-6.
- Reunanen A, Takkunen H, Knekt P, et al. Body iron stores, dietary iron intake and coronary heart disease mortality. J Intern Med 1995;238:223-30. PubMed
- Lund EK, Wharf SG, Fairweather-Tait SJ, Johnson IT. Oral ferrous sulfate supplements increase the free radical-generating capacity of feces from healthy volunteers. Am J Clin Nutr 1999;69:250-5.
- Rehman A, Collis CS, Yang M, et al. The effects of iron and vitamin C co-supplementation on oxidative damage to DNA in healthy volunteers. Biochem Biophys Res Comm 1998;246:293-8. PubMed
- Klipstein-Grobusch K, Grobbee DE, den Breeijen JH, et al. Dietary iron and risk of myocardial infarction in the Rotterdam Study. Am J Epidemiol 1999;149:421-8. PubMed
- Hansten PD, Horn JR. Drug Interactions Analysis and Management. Vancouver, WA: Applied Therapeutics Inc., 1997 and updates.
- Tatro DS, ed. Drug Interactions Facts. Facts and Comparisons Inc., St. Louis, MO. 1999.
- Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: National Academy Press, 2002.
- Campbell N, Paddock V, Sundaram R. Alteration of methyldopa absorption, metabolism, and blood pressure control by ferrous sulfate and ferrous gluconate. Clin Pharmacol Ther 1988;43:381-6..
- Schumann K, Borch-Iohnsen B, Hentze MW, Marx JJ. Tolerable upper intakes for dietary iron set by the US Food and Nutrition Board (commentary). Am J Clin Nutr 2002;76:499-500. PubMed
- Tuomainen TP, Punnonen K, Nyyssonen K, Salonen JT. Association between body iron stores and the risk of acute myocardial infarction in men. Circulation 1998;97:1461-6.. PubMed
- Salonen JT, Nyyssonen K, Korpela H, et al. High stored iron levels are associated with excess risk of myocardial infarction in Eastern Finnish men. Circulation 1992;86:803-11.. PubMed
- Campbell NRC, Hasinoff B. Ferrous sulfate reduces levodopa bioavailability: Chelation as a possible mechanism. Clin Pharmacol Ther 1989;45:220-5.. PubMed
- Campbell NRC, Hasinoff BB, Stalts H, et al. Ferrous sulfate reduces thyroxine efficacy in patients with hypothyroidism. Ann Int Med 1992;117:1010-3.. PubMed
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