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Zinc supplement Pregnancy: §4.6 verbatim: 'The safety of this product in human pregnancy has not been established. Zinc crosses the placenta and is present in breast milk.'

Zinc sulfate

Brand names: Solvazinc, Z Span Spansule

Zinc sulfate is an oral zinc salt used as a mineral supplement to treat or prevent zinc deficiency, including in malabsorption, prolonged parenteral nutrition and conditions such as acrodermatitis enteropathica.

Auto-extracted from the source labelling — not yet independently clinician-verified. These values were distilled from the UK SPC (or the US label where noted) but have not had a clinician sign-off. Confirm against the current SmPC before prescribing.

Adult dose

Dose: One tablet of Solvazinc 45mg Effervescent Tablets, dissolved in water, once to three times daily after meals. §4.2 verbatim: 'Adults: One tablet, dissolved in water, once to three times daily after meals.'
Route: Oral — §4.2 verbatim: 'Method of Administration: oral after dissolution in water.'
Frequency: Once to three times daily, after meals (§4.2 verbatim: 'once to three times daily after meals').
Max: Not stated — this SPC gives no maximum zinc dose and no daily ceiling; the regimen is bounded only by the top of the stated frequency range, three times daily. CAUTION: the only 'maximum' anywhere in this bundle is a SODIUM figure in §4.4 — 'This medicinal product contains 106mg sodium per tablet, equivalent to 5.3% of the WHO recommended maximum daily intake of 2g sodium for an adult' — which is a dietary sodium reference, not a zinc dose ceiling, and must never be used as one.
SCOPE — ORAL ZINC SUPPLEMENTATION ONLY. That is this page's primary use (page category 'Zinc supplement'), and it is what this SPC doses. The SPC states no regimen for Wilson's disease (this page already defers that to zinc acetate) and no regimen for any other indication. STRENGTH CAVEAT — READ BEFORE TRANSPOSING: the §4.2 posology contains no milligram figure at all; it doses in whole tablets. The only strength anywhere in the bundle is the product name itself, 'Solvazinc 45mg Effervescent Tablets.', and no §2 qualitative composition was fetched — so this source does not establish whether that 45 mg denotes elemental zinc or zinc sulfate salt (the strings 'elemental' and '125' appear nowhere in the bundle). The regimen above is therefore valid for the named 45 mg effervescent tablet only: do not convert it into milligrams of zinc, and do not apply it to another zinc sulfate presentation — this page's other listed brand, Z Span Spansule, is a different (modified-release) presentation and is not covered by this SPC. DURATION — §4.4 verbatim: 'Therapy should continue until clinical improvement occurs and Solvazinc can be replaced by dietary measures unless there is severe malabsorption, metabolic disease or continuing zinc loss. Continued long-term treatment with Solvazinc if zinc deficiency is no longer present may lead to copper deficiency.' ADMINISTRATION SPACING — §4.5 verbatim: 'Zinc may reduce the absorption of concurrently administered tetracyclines, also the absorption of zinc may be reduced by tetracyclines; when both are being given an interval of at least three hours should be allowed.' §4.5 also records mutual absorption interference with oral iron, penicillamine and trientine; reduced absorption of quinolones (ciprofloxacin, levofloxacin, moxifloxacin, norfloxacin, ofloxacin); reduced absorption of zinc with calcium salts; and inhibition of copper absorption by zinc. EXCIPIENTS — §4.4 verbatim: 'This product contains sorbitol (E420), therefore patients with rare hereditary problems of fructose intolerance should not take this medicine' and 'This medicinal product contains 106mg sodium per tablet, equivalent to 5.3% of the WHO recommended maximum daily intake of 2g sodium for an adult.' FLAGGED FOR THE REVIEWER — the existing page text contradicts itself on the salt-versus-elemental question: its dose line reads '45mg elemental zinc 1–3 times daily' while its clinical pearls read 'zinc sulfate 45mg ≈ 10mg elemental zinc'. Neither statement is supported by anything in this bundle; both should be resolved against SPC §2 before publication.

Paediatric dose

Route: Oral, after dissolution in water — as for adults.
Frequency: More than 30 kg and 10–30 kg: once to three times daily after meals. Less than 10 kg: once daily after meals.
Max: Not stated — this SPC gives no paediatric maximum dose and no daily ceiling.
WEIGHT-BANDED BY TABLET FRACTION, NOT PER KILOGRAM — dosePerKg is null because §4.2 doses children by weight band in whole and half tablets and gives no mg/kg figure at any age; no weight-calculator figure applies and no per-kilogram dose may be derived from these bands. concentration is null because an effervescent tablet has no milligrams-per-millilitre strength. §4.2 verbatim: 'Children: More than 30kg: One tablet, dissolved in water, once to three times daily after meals. 10-30kg: ½ tablet, dissolved in water, once to three times daily after meals. Less than 10kg: ½ tablet, dissolved in water, once daily after meals.' (the fetched text renders each half as the HTML entity '½', i.e. ½). The adult strength caveat applies unchanged: the bands are whole and half tablets of Solvazinc 45mg Effervescent Tablets, and this source does not establish the milligram content of a tablet, so they cannot be converted to milligrams or to another product. Verify all paediatric zinc dosing against a children's formulary before prescribing.

Dose adjustments

Renal

No dose adjustment is stated in the fetched sections. §4.4 verbatim: 'Accumulation of zinc may occur in cases of renal failure.'

Hepatic

Not stated — the fetched SPC sections (§4.2–4.6, §4.8) contain no hepatic impairment advice.

Dose auto-extracted from UK Summary of Product Characteristics (SPC) via the eMC; US FDA prescribing information (openFDA / DailyMed) — cross-check; US labelling may differ from UK — not yet clinician-verified. Always confirm against the product SmPC and your local formulary before prescribing.

Contraindications

  • Hypersensitivity to the active substance or to any of the excipients listed in section 6.1 (§4.3)
  • Copper deficiency (§4.3, cross-referring to §4.5)

Side effects

  • Abdominal pain, dyspepsia, nausea, vomiting, diarrhoea, gastric irritation and gastritis — §4.8 verbatim: 'Zinc salts may cause abdominal pain, dyspepsia, nausea, vomiting, diarrhoea, gastric irritation and gastritis.'
  • Irritability, headache and lethargy — §4.8 verbatim: 'There have also been cases of irritability, headache and lethargy observed.'
  • Reduced copper levels and potentially copper deficiency; §4.8 states the risk 'may be greater with long-term treatment (e.g. if zinc deficiency is no longer present) and/or with higher doses of zinc'
  • Neurological features of copper deficiency (§4.8): polyneuropathy, symptoms of which can include gait disturbances, ataxia and paraesthesia and/or hypoaesthesia
  • Haematological features of copper deficiency (§4.8): anaemia, neutropenia, leucopenia and pancytopenia

Monitoring

  • The fetched SPC sections specify NO laboratory monitoring — neither serum zinc nor serum copper levels are mentioned anywhere in the bundle. The items below are the clinical checks the SPC's own wording calls for.
  • Review the need to continue treatment — §4.4 verbatim: 'Therapy should continue until clinical improvement occurs and Solvazinc can be replaced by dietary measures unless there is severe malabsorption, metabolic disease or continuing zinc loss.'
  • Watch for copper deficiency on long-term treatment or higher doses (§4.4 and §4.8) — neurological features (polyneuropathy: gait disturbance, ataxia, paraesthesia/hypoaesthesia) and haematological features (anaemia, neutropenia, leucopenia, pancytopenia)
  • Renal impairment — §4.4 verbatim: 'Accumulation of zinc may occur in cases of renal failure.'

Clinical monograph

How it works

Zinc is an essential trace element that acts as a cofactor for numerous metalloenzymes and is required for normal wound healing, immune function, taste and growth; supplementation replenishes depleted stores.

Prescribing in practice

  • Prolonged or high-intake zinc supplementation can precipitate copper deficiency (with anaemia and neutropenia), so duration and need should be reviewed and copper status considered.
  • Zinc reduces absorption of oral iron, tetracyclines and quinolone antibiotics, and these should be separated in timing.
  • Gastrointestinal upset is common; taking it with or after food improves tolerability though absorption is somewhat reduced.

Monitoring

Monitor for clinical response and, with prolonged use, consider periodic assessment of copper and haematological indices.

Counselling the patient

  • Take separately from iron tablets and certain antibiotics, leaving a gap between doses.
  • Report any unexplained tiredness or recurrent infections during long-term use.
  • Do not continue indefinitely without review.

Evidence & guidelines

Use is supported by established trace-element guidance and the product SPC rather than a single landmark trial.

Reference: BAPEN guidelines; Drug verified in RxNorm (NLM); confirm dosing against the manufacturer SPC (eMC). Verify against your local formulary and current prescribing references before prescribing. The structured dose values shown have been reviewed by a clinician. Monograph status: clinician-reviewed (2026-07-04).

Related

Curated clinical cross-links plus same-class fallbacks.