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Ferrous Sulphate 200mg

Ferrous Sulphate 200mg

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  • ✔️ Treats iron deficiency anaemia in adults and children
  • ✔️ Restores haemoglobin levels and relieves fatigue
  • ✔️ Each tablet provides approximately 65mg elemental iron
  • ✔️ Suitable for pregnancy under medical supervision
  • ✔️ Clinically recommended first-line iron replacement therapy

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What Is Ferrous Sulphate 200mg Used For?

 

Iron deficiency is one of the most common nutritional deficiencies in the UK. When your body doesn't have enough iron, it can't produce sufficient haemoglobin — the protein in red blood cells that carries oxygen around your body. The result? Fatigue, breathlessness, pale skin, and a general sense of feeling run down. Ferrous sulphate 200mg is a well-established, clinically recommended iron supplement used to treat and prevent iron deficiency anaemia in adults and children. You can browse our wider range of vitamins and supplements if you're looking to support your overall nutritional health alongside iron treatment.

Each tablet contains 200mg of ferrous sulphate, which provides approximately 65mg of elemental iron — the form your body actually absorbs. It's available over the counter in the UK without a prescription for adults and children over 12, making it a convenient and affordable option for managing low iron levels.

 

How Does Ferrous Sulphate 200mg Work?

 

Iron is an essential mineral your body cannot produce on its own. When you swallow a ferrous sulphate tablet, the iron is released in the stomach and absorbed primarily in the upper part of the small intestine (the duodenum and jejunum). From there, it enters the bloodstream and is transported to the bone marrow, where it's incorporated into new red blood cells.

  • Iron is absorbed in its ferrous (Fe²⁺) form — ferrous sulphate provides iron in this readily absorbable state.
  • Once absorbed, iron binds to transferrin (a transport protein) and is carried to tissues that need it.
  • The bone marrow uses iron to synthesise haemoglobin, restoring the oxygen-carrying capacity of your blood.
  • Excess iron is stored as ferritin in the liver, spleen, and bone marrow for future use.

Vitamin C (ascorbic acid) can enhance iron absorption, which is why some people take their iron tablet with a small glass of orange juice. Conversely, tea, coffee, dairy products, and certain medications can inhibit absorption — so timing matters.

 

Who Should Use Ferrous Sulphate 200mg?

 

This tablet is suitable for a wide range of people, but it's particularly relevant if you've been told by a GP or pharmacist that your iron levels are low. Iron deficiency anaemia doesn't always cause obvious symptoms at first, so a blood test is the most reliable way to confirm a diagnosis before starting treatment.

  • Adults and children over 12 with confirmed iron deficiency anaemia
  • Pregnant women (under medical supervision) who need to maintain adequate iron levels
  • People with heavy menstrual periods who regularly lose significant amounts of iron
  • Individuals following a vegetarian or vegan diet who may have lower dietary iron intake

It is not suitable for everyone. People with haemochromatosis (iron overload disorder), haemolytic anaemia, or certain other blood conditions should not take iron supplements without medical advice. Always check with your pharmacist or GP first.

 

How Does Ferrous Sulphate Compare to Other Iron Supplements?

 

Feature Ferrous Sulphate 200mg Ferrous Fumarate 210mg
Elemental iron per tablet ~65mg ~68mg
Typical adult dose (treatment) 2–3 tablets daily 1–2 tablets daily
GI side effect profile Moderate Slightly lower in some patients
UK availability (OTC) Yes Yes

 

How Should You Store Ferrous Sulphate 200mg?

 

Store your ferrous sulphate 200mg tablets below 25°C in a dry place, away from direct sunlight and moisture. Keep the tablets in their original packaging until you're ready to use them. This helps protect them from humidity, which can degrade the tablet coating over time.

Crucially, keep this medicine out of the reach and sight of children. Iron overdose is a medical emergency — even a small number of tablets can be dangerous or fatal to a young child. If you suspect a child has swallowed iron tablets, call 999 or go to A&E immediately. Do not store iron tablets in handbags, on kitchen counters, or anywhere accessible to young children. If you're also managing other health conditions, our women's health range includes products that may complement your iron treatment plan.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Ferrous Sulphate 200mg specifications
Treatment category Iron deficiency anaemia
Mechanism of action Replaces iron stores; supports haemoglobin synthesis
Effective for Iron deficiency anaemia; iron deficiency prevention
Suitable for Adults and children over 12; pregnant women (under supervision)
Active ingredient Ferrous sulphate 200mg (approx. 65mg elemental iron)
Strengths 200mg
UK classification General Sale List (GSL) / Pharmacy (P) medicine
Drug class Iron supplement / Haematinic
Preparation Tablet
Route of administration Oral

Specifications of Ferrous Sulphate 200mg

 

What Is Ferrous Sulphate 200mg and What Is It Used For?

 

Ferrous sulphate 200mg is an oral iron supplement used to treat iron deficiency anaemia — a condition where your blood doesn't contain enough healthy red blood cells due to insufficient iron. It is also used to prevent iron deficiency in people at higher risk, such as pregnant women, those with heavy periods, or individuals with poor dietary iron intake. The NHS recommends ferrous sulphate as a first-line treatment for iron deficiency anaemia in most adults.

 

What Do You Need to Know Before Using Ferrous Sulphate 200mg?

 

Before taking ferrous sulphate, it's important to check whether it's appropriate for you. Do not take this medicine if any of the following apply:

  • You have haemochromatosis (iron overload disorder)
  • You have haemolytic anaemia or other non-iron-deficiency anaemias
  • You have a known allergy to ferrous sulphate or any of the tablet's excipients
  • You have repeated blood transfusions
  • You have peptic ulcer disease or inflammatory bowel disease (seek medical advice first)

Several medicines can interact with ferrous sulphate. Iron can reduce the absorption of other drugs, and some medicines can reduce iron absorption. Known interactions include:

  • Antacids and calcium supplements — reduce iron absorption; take at least 2 hours apart
  • Tetracycline and quinolone antibiotics — iron reduces their absorption; separate doses by at least 2–3 hours
  • Levothyroxine (thyroid medication) — iron can reduce its effectiveness; take at least 4 hours apart
  • Levodopa (Parkinson's medication) — absorption may be reduced
  • Bisphosphonates (e.g. alendronic acid) — take at least 2 hours apart

 

How Should You Use Ferrous Sulphate 200mg?

 

Always take ferrous sulphate exactly as directed by your doctor or pharmacist. Swallow the tablet whole with a full glass of water. Do not crush or chew the tablet.

  1. Take the tablet on an empty stomach if possible — this maximises iron absorption.
  2. If you experience stomach upset, take it with or just after food (this may slightly reduce absorption but improves tolerability).
  3. Avoid taking it with tea, coffee, milk, or dairy products, as these inhibit iron absorption.
  4. Taking it with a small glass of orange juice (vitamin C) can help improve absorption.
  5. Continue taking the full course as prescribed, even if you start to feel better.
Indication Age Group Dose Frequency
Treatment of iron deficiency anaemia Adults 200mg (1 tablet) 2–3 times daily
Prevention of iron deficiency Adults 200mg (1 tablet) Once daily
Treatment of iron deficiency anaemia Children 6–12 years As directed by doctor As directed
Pregnancy (iron deficiency) Pregnant adults As directed by midwife/GP As directed

If you're also managing digestive discomfort alongside your iron treatment, our indigestion range may help with any stomach-related symptoms.

 

What Are the Possible Side Effects of Ferrous Sulphate 200mg?

 

Like all medicines, ferrous sulphate can cause side effects, though not everyone experiences them. Gastrointestinal side effects are the most frequently reported. Importantly, your stools may turn dark green or black — this is completely normal and harmless, and is simply a sign that iron is passing through your digestive system.

Common side effects:

  • Nausea or feeling sick
  • Stomach pain or cramps
  • Constipation
  • Diarrhoea
  • Dark or black stools
  • Loss of appetite

Less common side effects:

  • Heartburn or indigestion
  • Vomiting
  • Skin rash or itching (possible allergic reaction — stop taking and seek advice)
  • Tooth discolouration (if liquid formulations are used — less relevant for tablets)

If you experience severe abdominal pain, blood in your stools, or signs of an allergic reaction (swelling of the face, lips, or throat; difficulty breathing), stop taking the tablets and seek urgent medical attention. For those who find constipation a persistent issue, our constipation range offers additional support.

 

How Should You Store Ferrous Sulphate 200mg?

 

  • Store below 25°C in a dry place, away from direct sunlight and moisture
  • Keep in the original packaging to protect from humidity
  • Keep out of the reach and sight of children — iron overdose can be fatal in young children
  • Do not use after the expiry date printed on the packaging
  • Do not dispose of medicines via wastewater or household waste — return unused tablets to your pharmacy

Written and reviewed by our qualified team

Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Ferrous Sulphate 200mg online in the UK?

You can buy Ferrous Sulphate 200mg online from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £7.00. It is available without a prescription for adults and children over 12. Simply add it to your basket and it will be dispatched directly to your door.

How does Ferrous Sulphate 200mg work in the body?

Ferrous sulphate provides iron in its ferrous (Fe²⁺) form, which is readily absorbed in the upper small intestine. Once absorbed, iron is transported to the bone marrow where it is used to produce haemoglobin in red blood cells. This restores the blood's ability to carry oxygen efficiently around the body, relieving symptoms of iron deficiency anaemia such as fatigue and breathlessness.

What is the correct dose of Ferrous Sulphate 200mg for adults?

For treating iron deficiency anaemia, the standard adult dose is one 200mg tablet taken two to three times daily. For prevention of iron deficiency, one tablet daily is usually sufficient. Always follow the advice of your GP or pharmacist, as your dose may vary depending on the severity of your deficiency.

When is the best time to take Ferrous Sulphate 200mg?

The best time to take ferrous sulphate is on an empty stomach, ideally 30 minutes before a meal, as this maximises iron absorption. If you experience nausea or stomach discomfort, taking it with or just after food is acceptable, though absorption may be slightly reduced. Avoid taking it with tea, coffee, or dairy products, as these can significantly reduce how much iron your body absorbs.

How do I manage side effects of Ferrous Sulphate 200mg?

The most common side effects — nausea, constipation, and stomach cramps — can often be managed by taking the tablet with food rather than on an empty stomach. Staying well hydrated and eating a fibre-rich diet can help with constipation. If side effects persist or are severe, speak to your pharmacist, who may suggest switching to an alternative iron preparation such as ferrous fumarate or a lower-dose supplement.

Can I take Ferrous Sulphate 200mg during pregnancy?

Yes, ferrous sulphate is commonly used during pregnancy to treat or prevent iron deficiency anaemia, which is particularly common in the second and third trimesters. You should always consult your midwife or GP before starting iron supplementation during pregnancy, as they will advise on the appropriate dose for your individual needs. Do not self-diagnose iron deficiency during pregnancy — a blood test is needed to confirm your iron levels.

Who is eligible to take Ferrous Sulphate 200mg?

Ferrous sulphate 200mg is suitable for adults and children over 12 who have been diagnosed with iron deficiency anaemia or who are at risk of developing it. It is not suitable for people with haemochromatosis, haemolytic anaemia, or other non-iron-deficiency anaemias. If you are unsure whether this product is right for you, speak to your pharmacist or GP before purchasing. You can also explore our vitamins and supplements range for broader nutritional support.

What happens if I miss a dose of Ferrous Sulphate 200mg?

If you miss a dose, take it as soon as you remember — unless it is nearly time for your next scheduled dose, in which case skip the missed dose entirely. Never take a double dose to compensate for a missed one, as this increases the risk of side effects. Try to take your tablets at the same times each day to help you remember.

How long does it take for Ferrous Sulphate 200mg to work?

Most people begin to notice an improvement in their energy levels and other symptoms within two to four weeks of starting treatment. However, it typically takes three to six months of consistent use to fully replenish your body's iron stores. Your GP will usually arrange a follow-up blood test to confirm that your haemoglobin and ferritin levels have returned to normal before advising you to stop treatment.

How long can you stay on Ferrous Sulphate 200mg?

Treatment duration depends on the severity of your iron deficiency and the underlying cause. Most people take ferrous sulphate for three to six months to treat anaemia, and may continue for a further period to replenish iron stores. If you need long-term supplementation — for example, due to ongoing heavy periods or a chronic condition — your GP will monitor your iron levels regularly to guide treatment duration.

Why do my stools turn black when taking Ferrous Sulphate 200mg?

Dark or black stools are a very common and completely harmless side effect of taking iron tablets. The colour change occurs because unabsorbed iron reacts with compounds in the gut, producing a dark pigment. This is not a sign of internal bleeding. However, if your stools are very dark and tarry with a foul smell, or if you notice bright red blood, contact your GP promptly as these can be signs of gastrointestinal bleeding unrelated to iron.

What are the alternatives to Ferrous Sulphate 200mg?

Common alternatives include ferrous fumarate 210mg, ferrous gluconate, and iron bisglycinate (a gentler form often marketed as "gentle iron"). Each contains a different amount of elemental iron and may have a slightly different side effect profile. Some people find ferrous bisglycinate causes fewer gastrointestinal side effects, though it is generally more expensive. Your pharmacist can help you choose the most suitable option based on your tolerance and needs.

Can Ferrous Sulphate 200mg interact with other medicines?

Yes, ferrous sulphate can interact with several medicines. It can reduce the absorption of tetracycline and quinolone antibiotics, levothyroxine, levodopa, and bisphosphonates. Antacids and calcium supplements can also reduce iron absorption. To avoid interactions, separate your iron tablet from these medicines by at least two to four hours. Always tell your pharmacist about all medicines you are taking, including over-the-counter products and supplements.

Is Ferrous Sulphate 200mg suitable for vegetarians and vegans?

Many ferrous sulphate tablet formulations are suitable for vegetarians, but not all are certified vegan — the tablet coating or excipients may contain animal-derived ingredients. Check the product packaging or patient information leaflet for confirmation. If you follow a vegan diet and are looking for iron support, you may also find our vegan range helpful for finding suitable supplement options.

What are the latest studies on iron supplementation for anaemia?

Current clinical evidence continues to support oral ferrous sulphate as a cost-effective and clinically effective first-line treatment for iron deficiency anaemia. Research has also explored alternate-day dosing — taking iron every other day rather than daily — as a strategy that may improve absorption and reduce gastrointestinal side effects in some patients. Speak to your GP or pharmacist about the most up-to-date dosing recommendations for your individual situation.

How Should You Use Ferrous Sulphate 200mg?

Swallow each tablet whole with a full glass of water — do not crush, chew, or break the tablet. Taking it correctly helps ensure the iron is released and absorbed as intended. Follow these steps for best results:

Never take more than the recommended dose. If you accidentally take too many tablets, seek emergency medical attention immediately — iron overdose is a serious medical emergency, particularly in children.

What Is the Correct Dose of Ferrous Sulphate 200mg?

The dose you need depends on whether you are treating an existing iron deficiency or simply trying to prevent one. Your GP or pharmacist will advise the most appropriate dose based on your blood test results and individual circumstances. The table below provides a general guide:

When Is the Best Time to Use Ferrous Sulphate 200mg?

For maximum absorption, take ferrous sulphate on an empty stomach — around 30 minutes before breakfast or between meals. If you are taking multiple doses per day, try to space them evenly throughout the day (for example, morning, midday, and evening). Consistency matters: taking your tablets at the same times each day makes it easier to remember and helps maintain steady iron levels in your body.

If you are also taking other medicines, check with your pharmacist about the best timing to avoid interactions. Some medicines — such as levothyroxine or certain antibiotics — need to be taken several hours apart from iron tablets to ensure both are absorbed properly.

How Long Can You Use Ferrous Sulphate 200mg For?

Treatment duration varies depending on the cause and severity of your iron deficiency. Most people with iron deficiency anaemia are advised to take ferrous sulphate for three to six months. This allows enough time to correct the anaemia and replenish the body's iron stores. Your GP will usually arrange a follow-up blood test after two to three months to assess your progress.

If your iron deficiency is caused by an ongoing condition — such as heavy menstrual bleeding or a chronic gastrointestinal condition — you may need longer-term supplementation under medical supervision. Do not stop taking your tablets early without speaking to your GP, even if your symptoms have improved.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

What Are the Most Common Side Effects of Ferrous Sulphate 200mg?

Gastrointestinal side effects are the most frequently reported with ferrous sulphate, and they occur because iron can irritate the lining of the stomach and intestines. These effects are usually mild and often improve after the first week or two of treatment. Taking the tablet with food rather than on an empty stomach can help reduce discomfort, though it may slightly lower the amount of iron absorbed.

  • Nausea or feeling sick
  • Stomach pain or abdominal cramps
  • Constipation
  • Diarrhoea
  • Dark green or black stools (harmless — caused by unabsorbed iron)
  • Loss of appetite

What Are the Less Common Side Effects of Ferrous Sulphate 200mg?

Some people experience side effects that are less frequent but still worth being aware of. These tend to occur more often at higher doses or in people with sensitive digestive systems. If any of the following become bothersome or persistent, speak to your pharmacist about adjusting your dose or switching to an alternative iron preparation.

  • Heartburn or indigestion
  • Vomiting
  • Bloating or flatulence
  • Skin rash or itching (may indicate a mild allergic reaction)
  • Headache

What Are the Serious Side Effects of Ferrous Sulphate 200mg?

Serious side effects from ferrous sulphate are rare when taken at the recommended dose, but they do require prompt medical attention. The most significant risk is iron overdose, which is a medical emergency — particularly dangerous in young children. Even a small number of adult-strength iron tablets can be fatal to a child, so always store this medicine securely out of their reach.

Seek urgent medical help if you or someone else experiences any of the following after taking ferrous sulphate:

  • Signs of a severe allergic reaction: swelling of the face, lips, tongue, or throat; difficulty breathing; severe skin rash
  • Very dark, tarry stools with a foul smell (may indicate gastrointestinal bleeding — distinct from the harmless black stools caused by iron)
  • Bright red blood in stools or vomit
  • Severe abdominal pain
  • Symptoms of iron overdose: nausea, vomiting, stomach pain, drowsiness, pale or bluish skin (call 999 immediately)

What Should You Do If You Experience Side Effects?

For mild gastrointestinal side effects, try taking your tablet with food, reducing your dose temporarily (with pharmacist guidance), or switching to an alternate-day dosing schedule. Staying well hydrated and eating a diet rich in fibre can help manage constipation. If side effects are significantly affecting your quality of life, your pharmacist may recommend a different iron salt — such as ferrous fumarate or iron bisglycinate — which some people find easier to tolerate.

You can report suspected side effects of any medicine in the UK through the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk. This helps regulators monitor the safety of medicines in real-world use.

Can Ferrous Sulphate 200mg Interact With Other Medicines?

Yes. Ferrous sulphate has several clinically significant drug interactions. Iron can reduce the absorption of other medicines taken at the same time, and some medicines can reduce iron absorption. To minimise the risk of interactions, always tell your pharmacist about every medicine you are taking — including prescription drugs, over-the-counter products, and herbal supplements.

  • Tetracycline and quinolone antibiotics — separate doses by at least 2–3 hours
  • Levothyroxine — take at least 4 hours apart from iron
  • Levodopa — iron may reduce its absorption and effectiveness
  • Bisphosphonates (e.g. alendronic acid) — take at least 2 hours apart
  • Antacids and calcium supplements — reduce iron absorption; take at least 2 hours apart
  • Penicillamine — iron reduces its absorption; separate by at least 2 hours

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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