How Does Uniroid-HC Work in the Body
Chemical Composition, Mechanism of Action & Metabolic Effects Explained
Key Takeaways: How Uniroid-HC Works
- Active Ingredients: Hydrocortisone 5 mg/g (corticosteroid) and cinchocaine hydrochloride 5 mg/g (amide‑type local anaesthetic).
- Dual Action: Cinchocaine blocks sodium channels to numb pain; hydrocortisone reduces inflammation, itching and swelling.
- Onset & Duration: Anaesthetic effect within minutes; anti‑inflammatory action develops over hours. Applied twice daily.
- Metabolism: Both agents are metabolised in the liver; minimal systemic absorption from intact skin.
- Safety: Not for children under 12, and avoid on infected skin. Prolonged use may cause skin thinning or adrenal suppression.
Uniroid-HC Ointment combines a local anaesthetic and a corticosteroid to rapidly relieve pain, itching and inflammation associated with haemorrhoids. Its dual mechanism targets both nerve signals and the underlying inflammatory process.
Important Medical Advice
Do not use Uniroid-HC if you are allergic to hydrocortisone, cinchocaine, or any ingredient. Avoid if you have tuberculosis, skin infections (e.g. thrush, viruses), or in children under 12. If you experience blurred vision, skin thinning, or signs of allergy, stop use and consult a doctor. Contains cetostearyl alcohol – may cause local skin reactions.
Chemical Composition & Molecular Structure
Uniroid-HC Ointment contains two active substances in a white soft paraffin base: hydrocortisone 5 mg/g and cinchocaine hydrochloride 5 mg/g. The formulation also includes cetostearyl alcohol as an emulsifier.
Structural Details
11β,17α,21‑trihydroxypregn‑4‑ene‑3,20‑dione
A corticosteroid with a cyclopentanoperhydrophenanthrene nucleus. It binds to cytoplasmic glucocorticoid receptors, modulating gene transcription to suppress inflammation.
2‑butoxy‑N‑(2‑diethylaminoethyl)quinoline‑4‑carboxamide hydrochloride
An amide‑type local anaesthetic with a quinoline ring. Its lipophilic nature allows rapid penetration of nerve membranes, where it blocks sodium channels.
White soft paraffin, cetostearyl alcohol
The ointment base provides occlusion and moisturisation, enhancing drug penetration. Cetostearyl alcohol stabilises the emulsion but may cause contact dermatitis in sensitive individuals.
Key Pharmaceutical Properties
| Property | Hydrocortisone | Cinchocaine |
|---|---|---|
| Lipophilicity (logP) | 1.6 | 3.8 |
| Protein binding | ~90% | ~70% |
| pKa | – (non‑ionisable) | 8.5 |
🗒️ Pharmaceutical insight: The combination of a lipophilic anaesthetic and a steroid in a paraffin base allows prolonged contact with the perianal skin, maximising local effect while minimising systemic absorption.
Mechanism of Action: Dual Pathway (Anaesthetic & Anti‑inflammatory)
Uniroid-HC relieves haemorrhoid symptoms through two complementary pharmacological actions.
- Cinchocaine – Sodium channel blockade: As an amide anaesthetic, cinchocaine penetrates nerve axons, becomes ionised, and binds to voltage‑gated sodium channels. This stabilises the channel in its inactivated state, preventing depolarisation and pain impulse propagation.
- Hydrocortisone – Glucocorticoid receptor activation: Hydrocortisone diffuses into cells and binds to cytoplasmic glucocorticoid receptors. The complex migrates to the nucleus, where it inhibits transcription of pro‑inflammatory cytokines (IL‑1, IL‑6, TNF‑α) and induces lipocortin, which blocks phospholipase A2 and reduces prostaglandin/leukotriene synthesis.
| Feature | Cinchocaine | Hydrocortisone |
|---|---|---|
| Onset of action | 2‑5 minutes | 1‑2 hours (max effect after days) |
| Duration | 2‑4 hours | Sustained with regular use |
| Primary effect | Pain relief, numbness | Reduced swelling, redness, itching |
🗒️ Physiological insight: Because inflammation itself can activate pain fibres, the steroid component indirectly contributes to analgesia by lowering inflammatory mediator levels.
Absorption & Distribution
When applied to intact perianal skin, systemic absorption of both drugs is low (typically <5% of the dose). Absorption increases on inflamed or broken skin, so application should be limited to the affected area.
Dermal absorption
Peak local concentrations occur within 1‑2 hours. The paraffin base forms an occlusive layer, enhancing hydration and penetration.
Distribution volume
Systemically absorbed fractions distribute widely: hydrocortisone Vd ~0.3 L/kg (bound to CBG); cinchocaine Vd ~2 L/kg due to lipophilicity.
Metabolic Effects & Elimination
Hydrocortisone: Primarily hepatic metabolism via reduction of the A‑ring and side‑chain cleavage, yielding tetrahydrocortisol and cortols. Metabolites are excreted renally as glucuronides. Prolonged high‑dose use may suppress endogenous cortisol production.
Cinchocaine: Metabolised in the liver by CYP3A4 to multiple metabolites, mainly by de‑ethylation and hydroxylation. Less than 5% excreted unchanged in urine. Because of low systemic exposure, metabolic interactions are unlikely with topical use.
⚠️ Metabolic caution: Patients with severe hepatic impairment may have reduced clearance, but topical use rarely causes significant accumulation. Regular use beyond one week should be supervised by a doctor to avoid adrenal suppression.
Clinical Efficacy for Haemorrhoids
Uniroid-HC is indicated for short‑term relief of pain, itching and inflammation associated with external and internal haemorrhoids. Clinical studies confirm:
- Significant reduction in pain scores within 24 hours (vs. placebo).
- Decreased oedema and erythema after 3‑5 days of twice‑daily application.
- Improved patient‑reported quality of life during acute haemorrhoidal episodes.
The combination offers faster symptom control than either component alone. For internal haemorrhoids, the supplied nozzle ensures targeted delivery.
Uniroid-HC FAQs
How quickly does Uniroid-HC work?
Cinchocaine starts numbing the area within minutes, providing rapid pain relief. The anti‑inflammatory effect of hydrocortisone builds over hours, with maximum benefit after a few days of regular use.
Can I use Uniroid-HC during pregnancy?
Use only if advised by your doctor. Although systemic absorption is minimal, there is limited data on safety in pregnancy. Avoid large or prolonged application.
How long can I use Uniroid-HC?
Uniroid-HC is intended for short‑term relief (up to one week). If symptoms persist, consult your doctor. Prolonged use can cause skin thinning or adrenal suppression.
Does Uniroid-HC cure haemorrhoids?
No, it relieves symptoms but does not cure the underlying haemorrhoidal veins. Lifestyle measures (high‑fibre diet, fluids) and medical treatments may be needed for long‑term management.
Can I use other creams with Uniroid-HC?
Avoid combining with other topical products unless directed by a pharmacist or doctor, as they may dilute the effect or increase irritation.
Need Uniroid-HC for Haemorrhoid Relief?
If you're experiencing painful or itchy piles, a UK‑registered doctor can assess your suitability and prescribe Uniroid‑HC online.
Secure Prescription & Next-Day Delivery
MHRA‑compliant | GPhC‑registered pharmacy | Discreet packaging | UK‑registered doctors
Start Haemorrhoids ConsultationRelated Uniroid-HC Guides
Medical Content Manager
Nabeel is a co‑founder and medical content manager of Chemist Doctor. He works closely with our medical team to ensure the information is accurate and up‑to‑date.
Medical Doctor
Dr. Feroz is a GMC‑registered doctor and a medical reviewer at Chemist Doctor. He oversees acute condition and urgent care guidance.
Medical Director
Usman is a co‑founder and medical director of Chemist Doctor. He leads the organisation's strategic vision, bridging clinical and operational priorities.
Review Date: 27 February 2026
Next Review: 27 August 2026
Published on: 27 February 2026
Last Updated: 27 February 2026