Rifampin

Legal status and availability in the UK

In our online pharmacy, Rifampin is available without a prescription, with discreet delivery to the United Kingdom in 9–21 days.

Basic rifampicin information

• INN (international nonproprietary name): Rifampicin (rifampin in the US)
• Brand names available in the United Kingdom: Rifadin; Rimactane; combination products Rifater and Rifinah
• ATC code: J04AB02 (antimycobacterials, antibiotics)
• Forms and dosages: Capsules 150 mg and 300 mg; oral suspension 100 mg/5 mL; powder for solution for infusion 600 mg
• Manufacturers in the United Kingdom: Sanofi (Rifadin), Sandoz (Rimactane)
• Registration status in the United Kingdom: Licensed by the MHRA
• OTC / Rx classification: Prescription-only medicine (POM)

Product identity, naming and classification

INN, synonyms and ATC code

What is rifampicin and why should the name matter to clinicians and patients?

The International Nonproprietary Name (INN) is rifampicin (the US spelling is rifampin).

The ATC code is J04AB02, placing rifampicin among antimycobacterials in subgroup AB (antibiotics).

Brand names and manufacturers

Marketed brands and producers

Which brands are available in the UK?

In the UK, brands include Rifadin and Rimactane, with combination products marketed as Rifater and Rifinah.

Major manufacturers include Sanofi and Sandoz.

Pharmaceutical forms, strengths and packaging

Available forms and strengths

Which forms are available?

Common pharmaceutical forms are tablets/capsules in 150 mg and 300 mg strengths, oral paediatric suspension 100 mg/5 ml, and injectable 600 mg vials as powder for solution.

Packaging varies between blisters, bottles and vials.

Indications and typical regimens (practical)

Indication-by-indication dosing summary

What are the typical doses?

Rifampicin is a first-line drug for tuberculosis, used in pulmonary and extrapulmonary disease as part of combination regimens.

Standard adult dosing is approximately 10 mg/kg once daily up to a maximum of 600 mg, typically continued for months depending on the regimen.

For leprosy rifampicin is given as 600 mg once monthly as part of supervised multi-drug therapy.

Meningococcal or Hib prophylaxis is often a short course of 600 mg given as per local protocol.

Children receive 10–20 mg/kg (maximum 600 mg) and require paediatric suspension or scored tablets where available.

Always remind patients that TB therapy is managed by specialist TB clinics and that community pharmacists should not alter prescribed regimens.

Administration, timing and patient counselling

Practical instructions for patients

How should patients take rifampicin to get the best effect and avoid confusion?

Advise patients to take rifampicin on an empty stomach for maximal absorption — one hour before or two hours after food.

If gastrointestinal upset is severe, taking doses with food is acceptable but reduces bioavailability and should be discussed with the prescriber.

Warn clearly about harmless red-orange discolouration of urine, sweat and tears, and advise contact-lens wearers to use spectacles while on therapy.

Missed-dose advice: take the missed dose as soon as remembered unless it is almost time for the next dose, and do not double-dose.

Counselling should cover major interactions (notably with oral contraceptives and warfarin), the LFT monitoring schedule and signs of liver injury.

Contraindications, cautions and pregnancy/lactation

Absolute vs relative contraindications

Which conditions should trigger refusal to supply or immediate prescriber contact?

Absolute contraindications include known hypersensitivity to rifampicin or other rifamycins and severe hepatic impairment.

Relative cautions include active liver disease, prior hepatitis or heavy alcohol use, porphyria and concurrent use of other hepatotoxic medicines.

Rifampicin has significant interactions with some protease inhibitors and antiretrovirals and may be unsuitable unless specialist advice is given.

In pregnancy and breastfeeding the decision rests on a risk–benefit discussion with the treating team; rifampicin crosses the placenta and appears in breast milk.

Pharmacists should liaise with TB services and obstetric teams for pregnant patients and advise neonatal monitoring for bleeding where appropriate.

Side effects, adverse reactions and monitoring

Common vs serious reactions and monitoring schedule

What should pharmacists watch for and communicate to patients when dispensing?

Common, usually mild effects include nausea, abdominal discomfort, diarrhoea, headache, fatigue and pruritus.

Red-orange discoloration of bodily fluids is expected and harmless; emphasise this to reduce alarm and improve adherence.

Laboratory signals commonly include asymptomatic transaminase elevations; serious hepatotoxicity is less frequent but important.

Serious but uncommon reactions include hepatitis, thrombocytopenia, acute renal injury and hypersensitivity syndromes requiring urgent review.

Monitoring recommendation for combination TB therapy is baseline liver function tests and reassessment at 2–4 weeks, then monthly or per local TB service protocols.

For patients on warfarin or antiepileptics suggest closer INR or level monitoring due to enzyme induction effects.

Drug interactions (practical pharmacy focus)

High-risk interactions and counselling steps

Which medicines need immediate attention when prescribed with rifampicin?

Rifampicin is a potent inducer of CYP3A4, CYP2C9, CYP2C19 and P‑glycoprotein, producing clinically significant interactions.

High-risk drug classes include antiretrovirals (notably protease inhibitors), hormonal contraceptives, warfarin, antiepileptics, oral hypoglycaemics, certain statins and immunosuppressants such as tacrolimus and ciclosporin.

Actionable steps: check the patient’s medication list, notify the prescriber of suspected interactions, and recommend specialist alternatives where appropriate, for example rifabutin for some antiretroviral regimens.

For women on oral contraceptives advise additional or alternative contraception while on rifampicin.

For warfarin suggest increased INR monitoring and dose adjustment as guided by anticoagulation services.

Special populations: children, elderly and comorbidities

Dose modification and monitoring nuances

How should pharmacists adapt counselling and supply for vulnerable groups?

Children require weight-based dosing (10–20 mg/kg) and formulations that caregivers can measure accurately, such as 100 mg/5 ml suspension or scored tablets.

Provide oral syringes and demonstrate measuring technique when dispensing paediatric suspension.

Elderly patients usually receive standard adult doses but need closer attention to frailty, polypharmacy and hepatic reserve, with more frequent LFT monitoring where indicated.

Renal impairment generally does not require dose adjustment for mild to moderate dysfunction, but monitoring is prudent and dialysis timing should be coordinated with specialists.

Severe hepatic impairment may require dose reduction, increased monitoring or avoidance; consult hepatology or TB services for specific cases.

Storage and disposal

Shelf-life and handling

How should rifampicin be stored?

Store rifampicin below 25°C and protect it from light and moisture, keeping medicines in their original packaging until use.

Injectable vials are often supplied as dry powder and should be stored intact until immediate reconstitution per the manufacturer’s instructions.

Follow printed expiry dates and respect manufacturer guidance for any reconstituted suspension expiry times.

Unused or returned rifampicin must be disposed of via the pharmacy’s medicinal waste stream; advise patients not to flush medicines down drains.

Alternatives and combination products

When to switch and fixed-dose options

When might an alternative to rifampicin be considered or a fixed-dose combination preferred?

Rifabutin is an alternative rifamycin often preferred in patients taking protease inhibitors because it has a different induction profile.

Other first-line TB drugs include isoniazid, ethambutol and pyrazinamide and are used in combination to prevent resistance.

Fixed-dose combinations such as Rifater (rifampicin + isoniazid + pyrazinamide) and Rifinah (rifampicin + isoniazid) simplify dosing and support adherence.

Pros of fixed-dose combinations include reduced pill burden and standardised dosing, while cons include reduced flexibility to alter single-agent doses and the need to match prescriber regimens.

Adherence support, DOTS and troubleshooting

Practical tips to reduce default and manage side effects

How can pharmacies actively support patients through long TB regimens?

DOS and observed therapy are core adherence tools; where DOTS is not provided, pharmacies can offer observed dosing for private patients to boost adherence.

Offer reminder SMS, app integrations, weekly blister packs or pill boxes and pharmacy consultation appointments to discuss side effects and interactions.

If orange discolouration alarms a patient, reassure them that it is harmless but expected and advise contact-lens wearers to switch to glasses during therapy.

For GI upset suggest timing adjustments or talking to the prescriber about symptomatic measures; for suspected hepatotoxicity (jaundice, severe nausea, dark urine), instruct immediate cessation and urgent clinical review.

Provide patients with TB clinic helplines and NHS 111 contact details and keep a local TB service contact list at the counter.

FAQs and quick reference

Rapid answers for common queries

Why is my urine orange?

Red‑orange staining of urine, sweat and tears is an expected and harmless effect of rifampicin.

Can I take rifampicin with the contraceptive pill?

Rifampicin reduces the effectiveness of hormonal contraceptives; advise additional or alternative contraception while on therapy.

What monitoring is needed?

Baseline and periodic liver function tests are recommended, typically at 2–4 weeks then monthly during combination TB therapy per local protocol.

Can I drink alcohol?

Avoid excessive alcohol because of additive hepatic risk and counsel patients accordingly.

• Checklist:
• Confirm prescription and indication and check for interacting medicines such as antiretrovirals, warfarin and hormonal contraception.
• Counsel on empty‑stomach dosing and provide the patient information leaflet and LFT monitoring schedule.
• Advise on orange discolouration and contact‑lens precautions and record supply batch and expiry details.

Delivery across the United Kingdom