orange urine on rifampicin signals kidney damage

discoloration of urine and other secretions is a normal pharmacologic effect, harmless, and resolves 1-2 days after discontinuation.

hormonal contraceptives keep working as usual

rifampicin reduces their efficacy below a reliable threshold. Barrier or non-hormonal methods are required during the course and for 4 weeks after.

latent TB can be managed with a 1-2 month course

the minimum effective rifampicin monotherapy course for LTBI is 4 months. Shorter courses increase the risk of reactivation and resistance.

Rifampicin is a mandatory component of the standard regimen for drug-susceptible tuberculosis. 2022 and /CDC/ATS 2016 recommend a 6-month regimen: 2-month intensive phase with isoniazid + rifampicin + pyrazinamide + ethambutol (HRZE), and 4-month continuation phase with isoniazid + rifampicin (HR). Rifampicin dose is 10 mg/kg/day (usually 600 mg). The alternative 4-month rifapentine-based regimen (HPMZ) is suitable for selected patients per WHO 2022.

Therapy is administered by tuberculosis specialists under DOT supervision. In HIV-coinfected patients, rifampicin is switched to rifabutin when a compatible ART regimen cannot be selected.

Sources

A

Latent tuberculosis infection

First line

Rifampicin 600 mg daily for 4 months (4R) is one of the preferred regimens for latent tuberculosis infection. CDC 2020 lists 4R alongside 3HP (isoniazid + rifapentine for 12 weeks) and 3HR (isoniazid + rifampicin for 3 months), favoring these over isoniazid monotherapy for 9 months in terms of tolerability and completion. Efficacy is 80-90% with proper course completion.

Sources

A

Meningococcal prophylaxis for close contacts

First line

Rifampicin 600 mg twice daily for 2 days is a first-line option for post-exposure meningococcal prophylaxis in close contacts. NG240 2024 ranks rifampicin alongside ceftriaxone IM as a single dose and ciprofloxacin 500 mg orally as a single dose. Prophylaxis is started within 24 hours of confirming the diagnosis in the index case.

Sources

B

Staphylococcal prosthetic joint infection

Adjunct

Rifampicin 300-450 mg twice daily is added to base therapy (vancomycin, cefazolin, levofloxacin) in staphylococcal periprosthetic infections after surgical debridement. 2013 includes rifampicin in DAIR (debridement, antibiotics, implant retention) regimens and for patients with retained prostheses. Its advantage is activity against staphylococcal biofilms. Not used as monotherapy due to rapid selection of resistance.

Sources

F

Uncomplicated viral upper respiratory infection

Not recommended

For acute uncomplicated viral upper respiratory infection, rifampicin is not prescribed. An antimycobacterial agent with a long list of significant drug interactions (CYP3A4/CYP2C9 induction) is used only under strict indications. Prescribing rifampicin for URI is an example of irrational therapy and increases the risk of selecting rifampicin-resistant M. tuberculosis strains in the population.

Sources

Practical notes

Timing and administration

Take 1 hour before or 2 hours after meals, with water. Fatty meals reduce bioavailability by 30%; fasting administration is mandatory. Morning dosing is preferred for tolerability and so that flu-like symptoms do not interfere with sleep. Antacids are separated by at least 1 hour.

Dose titration

Standard dose is 10 mg/kg/day (usually 600 mg) once daily. For active TB – daily administration for 2 + 4 months. For latent TB – 600 mg/day for 4 months. For periprosthetic infections – 300-450 mg twice daily as part of a combination regimen for 3-6 months depending on the extent of debridement. For meningococcal prophylaxis – 600 mg twice daily for 2 days. Dose adjustment in hepatic impairment is individualized by the tuberculosis specialist.

Monitoring

Before starting the course, check ALT, AST, total bilirubin, CBC, and creatinine. At week 2-4 and monthly thereafter, repeat liver enzymes. ALT above 3 ULN with symptoms or above 5 ULN without symptoms is an indication to interrupt therapy. During prolonged therapy (TB, prophylaxis), adherence, tolerability, and potential drug interactions with new co-medications are reassessed monthly.

Special situations

Rifampicin is a strong inducer of CYP3A4, CYP2C9, and P-glycoprotein. It lowers levels of: oral contraceptives (barrier methods or IUDs required), warfarin (dose increase and INR monitoring), oral antidiabetics, corticosteroids, tacrolimus, and cyclosporine (dose increase and level monitoring), DOACs (apixaban, rivaroxaban – not combined), statins, antiretrovirals (some PIs and NNRTIs are substituted). A full review of concomitant medications is performed before prescribing and during therapy.

Drug–nutrient interactions

Vitamin D

Rifampicin induces CYP3A4 and accelerates inactivation of 25(OH)D and 1,25(OH)2D, leading to vitamin D deficiency in 30-70% of patients on prolonged therapy. Check serum 25(OH)D before starting and every 3 months on long therapy. At levels below 30 ng/mL, prescribe cholecalciferol 2000-4000 IU/day.

Source: UpToDate: Rifamycins (rifampin, rifabutin, rifapentine) (2024)

Vitamin K

Rifampicin accelerates vitamin K metabolism through hepatic enzyme induction. Newborns of mothers who received rifampicin in the third trimester have an increased risk of hemorrhagic disease of the newborn. Vitamin K1 10 mg intramuscularly is given to the mother 24 hours before delivery and to the newborn in the first hours of life.

Source: UpToDate: Rifamycins (rifampin, rifabutin, rifapentine) (2024)

Vitamin B6

Rifampicin in TB regimens is combined with isoniazid, which displaces pyridoxine. In patients at risk of neuropathy (diabetes, HIV, chronic kidney disease, alcohol use, pregnancy), pyridoxine 25-50 mg/day is added to prevent peripheral neuropathy.

Source: UpToDate: Rifamycins (rifampin, rifabutin, rifapentine) (2024)

Drug–drug interactions

2 pairs found. Sorted from critical to minor.

Major

Ethinylestradiol

Estrogens. Natural and semisynthetic estrogens, plain

Mechanism

Рифампицин – мощнейший индуктор CYP3A4, снижает концентрацию этинилэстрадиола на 40–60%. Эффективность КОК резко падает.

Management

Использовать барьерные методы или ВМС на весь курс и 4 недели после. КОК как монометод противопоказаны.

Sources

WHO: WHO Medical eligibility criteria for contraceptive use (2023)

Pair details →

Major

warfarin

Vitamin K antagonist anticoagulants

Mechanism

Индукция CYP2C9 рифампицином снижает концентрацию варфарина на 50–70% через 2–3 недели.

Safety

Contraindications

Hypersensitivity to rifamycins in history
Active hepatitis or jaundice on prior rifamycin therapy
Concurrent use with drugs critically dependent on CYP3A4: HIV protease inhibitors, voraxapar, simeprevir, apixaban/rivaroxaban without dose adjustment, tacrolimus without monitoring
History of porphyria
Severe hepatic impairment

Serious adverse effects

Drug-induced hepatitis, hepatic failure
Hemolytic anemia, thrombocytopenic purpura, agranulocytosis
Acute renal failure (interstitial nephritis) with intermittent dosing
DRESS syndrome, toxic epidermal necrolysis (rare)

Common adverse effects

Orange-red discoloration of urine, tears, sweat, sputum (harmless, resolves after discontinuation)
Nausea, abdominal discomfort
Transient liver transaminase elevation
Reduced efficacy of hormonal contraceptives

Uncommon adverse effects

Rash, pruritus
Flu-like syndrome with intermittent dosing (fever, myalgia, malaise)
Thrombocytopenia

Pregnancy

Frequently asked

What is rifampicin used for?

rifampicin is evaluated for the following indications with varying evidence strength: Drug-susceptible tuberculosis (evidence tier A), Latent tuberculosis infection (evidence tier A), Meningococcal prophylaxis for close contacts (evidence tier A). See the full indication matrix with dosing and citations above on this page.

What are the side effects of rifampicin?

Common side effects of rifampicin (≥ 1 in 100): Orange-red discoloration of urine, tears, sweat, sputum (harmless, resolves after discontinuation), Nausea, abdominal discomfort, Transient liver transaminase elevation, Reduced efficacy of hormonal contraceptives. See the Safety section for uncommon and serious reactions.

Is rifampicin safe during pregnancy?

FDA category C. FDA category C. In humans, rifampicin is used for active TB during pregnancy because untreated TB poses a greater risk to mother and fetus. Newborns of mothers on rifampicin in the third trimester are at risk of postpartum hemorrhage due to vitamin K deficiency – vitamin K is given to both mother and infant. The decision is made jointly with the tuberculosis specialist and obstetrician-gynecologist.

Is rifampicin compatible with breastfeeding?

Rifampicin passes into breast milk in small amounts. LactMed classifies it as compatible with breastfeeding during TB treatment. Monitor the infant for jaundice and reduced appetite.

Who should not take rifampicin?

rifampicin is contraindicated in: Hypersensitivity to rifamycins in history; Active hepatitis or jaundice on prior rifamycin therapy; Concurrent use with drugs critically dependent on CYP3A4: HIV protease inhibitors, voraxapar, simeprevir, apixaban/rivaroxaban without dose adjustment, tacrolimus without monitoring; History of porphyria; Severe hepatic impairment. Full list in the Safety section.

rifampicin

Mechanism of action

Indications

Drug-susceptible tuberculosis

Latent tuberculosis infection

Meningococcal prophylaxis for close contacts

Staphylococcal prosthetic joint infection

Uncomplicated viral upper respiratory infection

Practical notes

Timing and administration

Dose titration

Monitoring

Special situations

Drug–nutrient interactions

Vitamin D

Vitamin K

Vitamin B6

Drug–drug interactions

Ethinylestradiol

warfarin

Safety

Contraindications

Serious adverse effects

Common adverse effects

Uncommon adverse effects

Pregnancy

Frequently asked

Common myths

Breastfeeding