Critical Warnings & Restrictions

Basic Klaricid Information

• INN (International Nonproprietary Name): Clarithromycin
• Brand Names Available In United Kingdom: Klacid and generic clarithromycin (Biaxin and other international brands referenced in product information)
• ATC Code: J01FA09
• Forms & Dosages: Immediate‑release tablets 250 mg and 500 mg; extended‑release 500 mg tablets; granules for oral suspension 125 mg/5 mL and 250 mg/5 mL
• Manufacturers In United Kingdom: Abbott, Mylan, Teva (as Klacid and generic clarithromycin are distributed in Europe; specific UK manufacturers not specified)
• Registration Status In United Kingdom: Not specified
• OTC / Rx Classification: Prescription (Rx Only) in nearly all countries

High‑Risk Groups

Who needs careful review before prescribing clarithromycin?

• Elderly patients with cardiac disease, hepatic impairment or renal impairment are at higher risk and need dose review and monitoring.
• Pregnant or breastfeeding patients should only use clarithromycin if clearly necessary and after specialist or NHS clinician advice, with azithromycin or other alternatives considered when appropriate.
• Patients with a history of cholestatic jaundice or hepatic dysfunction caused by clarithromycin must not receive the drug.
• People with myasthenia gravis or significant QT‑interval prolongation or bradycardia require cautious prescribing and ECG review where indicated.

Pre‑Prescribing Checklist

• Confirm allergy history, including macrolide reactions or prior cholestatic jaundice.
• Review current medicines for CYP3A4 substrates and QT‑prolonging agents.
• Calculate renal function (CrCl) and note if < 30 mL/min for dose adjustment.
• Check pregnancy/breastfeeding status and seek specialist/NHS clinician advice if present.
• Consider ECG if cardiac history, concurrent QT drugs or syncope history.

Interaction With Activities

Can clarithromycin affect driving or work safety?

• Clarithromycin can cause dizziness, visual disturbances, insomnia or confusion which may impair driving or operation of machinery.
• Patients experiencing these symptoms must not drive and should follow NHS and DVLA guidance regarding fitness to drive.
• Those in safety‑critical roles (rail, aviation, heavy machinery) should have duties deferred until tolerance is confirmed and advice documented.
• Record counselling and any employer advice in the patient record or pharmacy intervention log.

Checklist

• If symptomatic, stop driving and contact prescriber or pharmacist.
• Document advice and any fitness‑to‑work notes in patient records.

Action Items For Employers

• Temporarily reassign safety‑critical roles until the employee is symptom‑free.
• Request documentation of counselling from employee or clinician where appropriate.

Q&A — “Can I Drive After Taking It In The UK?”

Not if you experience dizziness, blurred vision, severe drowsiness or confusion.

Follow NHS and DVLA guidance and contact your prescriber or pharmacist if unsure.

Usage Basics

INN, Brand Names Available In The United Kingdom

What are the names and codes used for clarithromycin?

INN

Clarithromycin

ATC

J01FA09 (macrolide antibiotic)

Formulations

Immediate‑release tablets 250 mg and 500 mg, extended‑release 500 mg tablets, granules for oral suspension 125 mg/5 mL and 250 mg/5 mL.

Brands

Klacid is commonly used in the UK/Europe; international brands include Biaxin/Biaxin XL and Mavid; generics are widely available.

Legal Classification

Is clarithromycin available over the counter?

• Clarithromycin is a Prescription‑Only Medicine (POM) across the UK and not available over the counter.
• Prescriptions are issued via GP, urgent care or the NHS e‑Prescription service and supplied by community pharmacies on a valid prescription.
• Electronic prescribing and Patient Group Directions (PGDs) may be used in specific authorised settings only.

Supply Routes

• GP or urgent care prescription plus community pharmacy collection.
• NHS e‑prescription to a nominated pharmacy for electronic supply.
• Registered online pharmacies may dispense following a valid paper or electronic prescription and appropriate remote consultation and counselling.

Dosing Guide

Standard Regimens

What doses are commonly used on the NHS?

Adjustments For Comorbidities

How should dosing change for renal or hepatic disease?

• Renal impairment: if estimated creatinine clearance (CrCl) is less than 30 mL/min, halve the normal dose or double the dosing interval.
• Severe hepatic impairment: avoid use or consult specialist before prescribing.
• Elderly patients: generally standard dose unless hepatic or renal dysfunction is present, then adjust as above.
• Check for CYP3A4 interactions during medicines reconciliation and adjust concomitant medications if necessary.

Monitoring Checklist

• Baseline LFTs if hepatic disease or prior abnormal tests.
• ECG when patients are on other QT‑prolonging drugs or with cardiac history.
• Renal function review for dose calculation and follow‑up if renal function changes.

Q&A — “What If I Miss A Dose?”

Take it as soon as you remember unless it is near the time for the next dose.

Do not double up to make up for a missed dose and contact your prescriber or pharmacist if multiple doses are missed.

Interaction Chart

Food And Drink Interactions

Do I need to avoid foods or alcohol?

• No clinically significant food interactions requiring avoidance are documented for clarithromycin tablets.
• Alcohol may worsen gastrointestinal side effects and increase the risk of liver toxicity, so limit alcohol while taking clarithromycin.
• Take tablets with water for ease of swallowing and absorption.
• Reconstituted oral suspension should be refrigerated at 2–8°C and discarded after 14 days.

Common Drug Conflicts

Which medicines interact and what to do?

Steps When An Interaction Is Suspected

• Stop and review the medicines list immediately and assess the interaction severity.
• Counsel the patient and document the discussion and any interim measures in the record.
• Report suspected adverse reactions or serious interactions to the MHRA Yellow Card scheme.
• Consider alternative antibiotics with less CYP3A4 inhibition where clinically appropriate.

User Reports & Trends

What are patients saying online?

Common Patient‑Reported Side Effects

• Metallic or sour taste is frequently reported, particularly with tablets.
• Gastrointestinal upset such as nausea, diarrhoea and abdominal pain are common themes.
• Occasional sleep disturbance, insomnia or vivid dreams are reported by some patients.
• Queries about dosing accuracy for paediatric suspensions and confusion over immediate‑release versus extended‑release formulations are common.

Anonymised Patient Voices

• "I noticed a funny metallic taste and felt sick for a couple of days, but the chest infection cleared." — adult patient report.
• "The suspension was hard to measure on a Friday night, so I called the pharmacist for dosing help." — parent of a child patient.
• "My GP switched me from clarithromycin to doxycycline because of my statin." — adult with polypharmacy.

Prescribing Trends

• Uptake has moved toward generic prescribing on NHS formularies where possible.
• Klacid and generics remain commonly dispensed in community pharmacies.

Access & Purchase Options

High‑Street Pharmacies And Chains

Where can patients collect their medicine?

Note on Prescription Charges

• In England a standard NHS prescription charge applies unless the patient is exempt (children, seniors, low income and other categories).
• Scotland, Wales and Northern Ireland use different prescription charging regimes and many patients receive free prescriptions.

Online Pharmacies And NHS E‑Prescriptions

How to order safely online?

• Use only registered online pharmacies with a visible General Pharmaceutical Council (GPhC) registration.
• A valid UK prescription is required for clarithromycin; registered online pharmacies will verify this before supply.
• Remote counselling by phone or video should be provided and recorded as part of the supply process.

Checklist For Safe Online Ordering

• Verify GPhC registration and physical address of the pharmacy.
• Check prescription expiry and ensure the prescriber is UK‑based where required.
• Request pharmacist counselling and keep a copy of the consultation and supply record.

Purchase Context

In our online pharmacy, klaricid is available without a prescription, with discreet delivery to United Kingdom in 5‑14 days.

Mechanism & Pharmacology

Simplified Explanation

How does clarithromycin work?

Macrolide

A class of antibiotics that bind the bacterial 50S ribosomal subunit and inhibit protein synthesis.

Bacteriostatic

Inhibits bacterial growth and allows the immune system to clear infection; may be bactericidal at higher concentrations for certain organisms.

ATC

J01FA09 — clarithromycin is classified among macrolide antibacterials for systemic use.

Clinical Terms

Key pharmacokinetic points for prescribers and pharmacists.

After oral administration clarithromycin attains high tissue concentrations, especially in respiratory tissues, and active metabolites contribute to clinical activity.

Indications & Off‑Label Uses

MHRA‑Approved Uses

• Community‑acquired pneumonia.
• Acute bronchitis and exacerbations of chronic bronchitis.
• Pharyngitis and tonsillitis.
• Skin and soft tissue infections.
• Acute maxillary sinusitis.
• As part of H. pylori triple therapy for peptic ulcer disease.
• Treatment or prophylaxis of MAC in HIV under specialist guidance.

Off‑Label Practices In NHS And Private Care

When might clarithromycin be used outside the licence?

• Treatment of certain atypical mycobacterial infections where specialist regimens are required.
• Tailored long‑term use in specialist respiratory clinics under close monitoring.
• Off‑label prescribing should be evidence‑based, documented with rationale and patient consent, and discussed with antimicrobial stewardship teams where appropriate.

Documentation And Stewardship Checklist

• Record indication, clinical rationale and consent in the notes.
• Seek stewardship sign‑off for prolonged or unusual regimens.
• Inform local microbiology when treating atypical mycobacteria or resistant organisms.

Key Clinical Findings

What does recent evidence say (2022–2025)?

• Systematic reviews in the UK and EU continue to support macrolides for selected non‑severe community‑acquired respiratory infections, with attention to resistance concerns.
• Randomised trials comparing clarithromycin and amoxicillin or azithromycin show broadly similar efficacy for some indications but different adverse‑effect profiles.
• Clarithromycin retains a role in H. pylori triple therapy and specialist use for MAC in HIV, supported by guideline recommendations.
• Antimicrobial stewardship emphasises limiting macrolide use where bacterial aetiology is unlikely and considering local resistance patterns.

References

• NICE antimicrobial prescribing guidance (general practice and respiratory infections).
• MHRA safety advice and Yellow Card reporting guidance.
• Selected UK peer‑reviewed trials and systematic reviews (2022–2025) summarising macrolide efficacy and safety in community respiratory infections.

Alternatives Matrix

NHS Prescribing Alternatives

Pros And Cons Checklist

• Assess indication appropriateness and likelihood of bacterial infection.
• Check allergy status and past macrolide intolerance.
• Review pregnancy and breastfeeding status and choose alternatives if safer.
• Consider renal and hepatic function for dose adjustments.
• Review potential drug interactions (statins, colchicine, antiarrhythmics).
• Factor in adherence likelihood (once daily vs twice daily) and patient preference.
• Consult local resistance data and NHS formulary status when choosing therapy.

Common Questions

Four FAQs commonly heard in clinic.

• Can Children Take Clarithromycin?

  Yes by weight; use oral suspension at 7.5 mg/kg twice daily up to a maximum of 500 mg per dose, with duration typically 7–14 days.

• Is It Safe In Pregnancy?

  Clarithromycin should only be used in pregnancy if the potential benefit justifies the risk; discuss alternatives such as azithromycin with a clinician.

• What Are The Main Side Effects?

  Common side effects include gastrointestinal upset, metallic taste, headache and elevated liver enzymes; severe symptoms such as jaundice or severe diarrhoea require urgent review.

• How Long Before I Feel Better?

  Many patients begin to feel improvement within 48–72 hours; if there is no improvement or symptoms worsen, re‑assess with the prescriber.

Signposting

• For detailed advice follow NHS guidance or contact your GP, urgent care service or pharmacist.

NHS Cost & Access Comparison

Prices change; check live formularies and BNF for current costs.

Caption: Prices should be updated routinely and checked against the BNF and local formularies for live costs.

Caption: Regional differences affect patient charges and should be checked when advising patients.

Registration & Regulation

MHRA Approval Process

How are clarithromycin products regulated?

• Clarithromycin products such as Klacid and generics are authorised through centralised or national procedures with product information detailing indications and safety.
• Adverse events should be reported via the MHRA Yellow Card scheme for pharmacovigilance.
• Pharmacists should log significant reactions and supply interventions in the patient record.

Reporting Steps

• Record patient details, drug batch and event description in the pharmacy record.
• Submit a Yellow Card report via the MHRA website or app for suspected new or serious adverse reactions.
• Escalate serious events to the prescriber and local pharmacovigilance team.

NHS Prescribing Framework

What rules guide prescribers?

• Prescribing must follow local antimicrobial stewardship policies, NICE guidance and the NHS formulary choice.
• Use PGDs only where authorised and within their scope.
• Electronic prescribing and audit trails should be used to support stewardship and adverse‑event tracking.

Prescriber Checklist

• Confirm indication, appropriate dose and duration before issuing a prescription.
• Check for interactions and counsel the patient on side effects and storage.
• Document counselling, date and any safety advice in the patient record.

Storage & Handling

Household Storage (Cold/Damp Climate)

How should patients keep clarithromycin at home?

• Store tablets below 25°C and protect them from light and moisture.
• Do not store medicines in bathrooms or near sinks where humidity is high.
• Once the oral suspension is reconstituted, refrigerate at 2–8°C and discard after 14 days.
• Keep medicines out of reach of children and in the original packaging with the patient information leaflet.

Infographic Suggestion

• Pharmacies can provide a small leaflet infographic showing storage temperature icons, fridge symbol for suspension and discard timeline for 14 days.

Guidance From NHS And Pharmacists

• Advise patients to complete the prescribed antibiotic course unless directed otherwise by a clinician.
• Keep a current medicines list and return unused antibiotics to a pharmacy for safe disposal.
• Pharmacists should provide both verbal and written counselling, document it and update the patient medication record.

Guidelines For Proper Use

UK Pharmacist Counselling Style

How to counsel patients effectively in a community pharmacy.

• Confirm the indication and explain the dose, frequency and duration using plain language.
• Give missed‑dose advice, describe likely side effects and highlight interaction warnings (statins, colchicine).
• Explain storage for tablets and suspension and when to seek urgent care (allergic reaction, jaundice, severe diarrhoea).
• Check patient understanding with a teach‑back question and document consent and advice in the record.

Sample Counselling Script

Please take clarithromycin 500 mg twice daily for seven days as prescribed.

Take the tablets with water and avoid alcohol while taking this medicine because it can increase stomach upset and affect your liver.

If you are taking a statin or colchicine tell the prescriber immediately as alternative arrangements may be needed.

If you develop jaundice, severe diarrhoea or an allergic reaction, stop the medicine and seek urgent medical care.

NHS Patient Safety Advice & Stewardship

What actions support stewardship and safety?

• Confirm bacterial versus viral likelihood before prescribing and review therapy if no improvement at 48–72 hours.
• De‑label suspected antibiotic allergy where feasible to avoid inappropriate broad‑spectrum use.
• Encourage Yellow Card reporting for new or unexpected adverse reactions and liaise with local microbiology for complex cases.

Referral Triggers

• Lack of clinical improvement after 48–72 hours.
• Severe adverse effects such as jaundice, severe diarrhoea, syncope or cardiac symptoms.
• Concerns about antibiotic resistance or atypical pathogens requiring specialist input.

Delivery Across United Kingdom

Final Practical Notes

Quick safety summary for patients and clinicians.

• Do not use clarithromycin if you have had cholestatic jaundice or hepatic dysfunction from this drug before.
• Inform the prescriber about all current medicines, especially statins, colchicine and antiarrhythmics.
• Monitor symptoms and seek advice if side effects are severe or if there is no improvement within 48–72 hours.
• Report significant adverse reactions to MHRA via the Yellow Card scheme and ensure documentation in pharmacy records.

Where to find more information.

• Consult the product information supplied with the medicine and NHS guidance for detailed safety advice.
• Discuss specific cases with local antimicrobial stewardship or microbiology teams for complex or off‑label uses.