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Beseha
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The 30-second answer
Yes, iron can cause constipation: the NHS lists constipation or diarrhoea, tummy pain, feeling sick and darker poo, and a review of 43 trials found ferrous sulfate raises digestive side effects (OR 2.32). You can lessen it by taking it with or soon after food, adding fibre, water and walking, and asking your doctor about alternate-day dosing; do not stop iron by yourself.
Why does iron cause constipation?
The NHS counts constipation as a common side effect of iron tablets, along with diarrhoea, tummy pain, heartburn, feeling sick and darker poo. A 2015 review (43 trials, 6,831 adults) found ferrous sulfate raised the risk of digestive side effects versus placebo (OR 2.32, interval 1.74 to 3.08) and versus intravenous iron (OR 3.05), and in pregnant women (7 trials) OR 3.33. Surprisingly the review found no relation between side effects and dose. Per the NHS, doses above 20 mg a day may cause constipation, nausea, vomiting and stomach pain.
How to lessen it
- With food: the NHS says take the tablet with or soon after food to reduce side effects, keep taking it even if they appear, and tell your doctor.
- Fibre, water and movement: the NHS advises fruit, vegetables and cereals, plenty of water, and a daily walk or run; a difference may show within days or weeks.
- Alternate days: in a trial (150 women, ferritin ≤30) the same total dose on alternate days gave the same ferritin as daily dosing (44.8 vs 43.8) and fewer digestive side effects (on iron days, 1.56 times more with daily dosing). But it was in women with low stores, not confirmed anaemia, so ask your doctor before changing the schedule.
- Ask a pharmacist: if food changes do not help, the NHS says a pharmacist can suggest a suitable laxative.
- No source we opened shows a particular form is gentler: not liposomal, liquid or bisglycinate; so we do not repeat “gentle on the stomach” claims from product pages.
Iron products at Beseha
The full guide to iron types is in iron supplements in Egypt. Here are four people ask about, with the stated dose. Test first, and the dose is set with your doctor.
#1
30 mg ironAfter food
Ferrocal Forte – 20 Capsules
Iron with vitamin C, B12, folic acid and zinc
EGP 170
EGP 8.5 per day · 20 days
- The page: each capsule has 30 mg iron, 120 mg vitamin C and 10 mcg B12
- The page: one capsule a day after food with enough water
- 20 capsules = 20 days
Heads-up: The page calls it “stomach-friendly”, which we found no source for; and 30 mg is above the 20 mg the NHS says may cause constipation
#2
45 mg iron21 vitamins and minerals
Sleevar Iron – 30 Capsules
One capsule after the main meal
EGP 390
EGP 13.0 per day · 30 days
- The page: 45 mg iron per capsule with B vitamins, A, C, D3, E and K1
- The page: one capsule after the main meal, keeping tea, coffee, milk and calcium 2 hours apart
- 30 capsules = 30 days
Heads-up: 45 mg is the adult upper limit per the page, and well above the NHS 20 mg; not for pregnancy, and do not add another iron product
#3
No ironLactoferrin
Dulefer Lactoferrin 100 mg – 14 Sachets
A milk protein that binds iron, with no iron in it
EGP 200
EGP 14.3 per day · 14 days
- The page: 100 mg lactoferrin per 5 g sachet, no iron
- The page: prevention 1 sachet a day; iron deficiency 2 a day as your doctor advises
- A 2017 pregnancy meta-analysis: fewer digestive side effects than ferrous sulfate
Heads-up: It contains dairy derivatives; and it does not replace anaemia treatment prescribed by your doctor
#4
18 mg iron per 5 mlLiquid
Nature’s Way Liquid Iron – 480 ml
A berry-flavoured liquid iron
EGP 1,400
EGP 14.6 per day · 96 days
- The page: every 5 ml has 18 mg iron (ferrous gluconate)
- The page: 5 ml a day or as your doctor advises
- The page: adults, teens and children over 4; 480 ml = 96 doses
Heads-up: The page says it “doesn’t cause constipation”, which we do not repeat: the NHS lists constipation for iron in general. It contains sorbitol
| Product | Iron per dose | Price | Per day |
|---|---|---|---|
| Ferrocal Forte – 20 Capsules | 30 mg | EGP 170 | EGP 8.5 |
| Sleevar Iron – 30 Capsules | 45 mg | EGP 390 | EGP 13.0 |
| Dulefer Lactoferrin 100 mg – 14 Sachets | No iron | EGP 200 | EGP 14.3 |
| Nature’s Way Liquid Iron – 480 ml | 18 mg (5 ml) | EGP 1,400 | EGP 14.6 |
Ask your doctor or pharmacist first if
- You have not had a test (blood count and ferritin) and take iron by yourself: extra iron is not helpful.
- Constipation does not improve with food changes, or there is severe pain or blood in the stool.
- You are pregnant: some of these products are not for pregnancy per their pages.
- You take levothyroxine, an antibiotic or an antacid: separate them per the product page.
- Children: an iron overdose in a young child can be fatal per the NHS, so keep it out of reach.
Want to ask?
Beseha pharmacists answer on WhatsApp. Tap the “Ask a pharmacist” button and tell them your tests and medicines.
FAQ
Does iron cause constipation?
Yes, the NHS lists constipation or diarrhoea, tummy pain, feeling sick and darker poo among the effects of iron tablets, and a review of 43 trials found more digestive side effects with ferrous sulfate (OR 2.32).
How do I avoid iron constipation?
Take the tablet with or soon after food, add fibre, water and daily walking per the NHS, and ask your doctor about alternate-day dosing.
Should I stop iron if it causes constipation?
No; the NHS advises to keep taking the tablets even with side effects and to tell the doctor, who may ask for follow-up tests.
Does liquid or liposomal iron avoid constipation?
We found no evidence in the sources we opened that any particular form is gentler, and the NHS lists constipation for iron in general.
Is lactoferrin an alternative?
A 2017 pregnancy review found fewer digestive side effects with lactoferrin than ferrous sulfate, but it contains no iron, and treatment is directed by your doctor.
When should I see a doctor about constipation?
If it does not improve with diet changes, or there is severe pain or blood in the stool; and a pharmacist can suggest a suitable laxative per the NHS.
Read next: iron supplements in Egypt and signs of nutritional deficiency.
The bottom line
Constipation is a known effect of iron. Take it with or after food, and add fibre, water and walking. Ask your doctor about alternate-day dosing, do not stop iron by yourself, and do not believe “no constipation” promises without a source.
Sources
- NHS: Iron deficiency anaemia treatment
- NHS: Iron
- NHS: Side effects of ferrous sulfate
- Tolkien et al. 2015: Ferrous sulfate and GI side effects, meta-analysis
- von Siebenthal et al. 2023: Alternate day iron
- Abu Hashim et al. 2017: Lactoferrin or ferrous salts in pregnancy
This content is for information and is not a substitute for advice from a doctor or pharmacist. Prices and availability may change; the final price is on the product page.
