Isoniazid+rifampicin
About Isoniazid+rifampicin
Isoniazid+rifampicin is a prescription oral medicine used to treat active and latent tuberculosis infections. It combines two active antibiotics that work together to eliminate the bacteria causing the infection. Taking this medicine helps cure the infection and prevents it from spreading to others.
To work effectively, you must take Isoniazid+rifampicin consistently every day exactly as prescribed, even if you start feeling better. It should be taken on an empty stomach, either one hour before or two hours after a meal, with a full glass of water. Maintaining a balanced diet and getting plenty of rest are helpful lifestyle changes during your recovery.
While taking this medicine, you may notice mild side effects like your urine, sweat, or saliva turning an orange-red colour. However, if you experience more serious symptoms such as severe abdominal pain, persistent nausea, or yellowing of your skin and eyes, you must contact your doctor immediately.
Do not take this if you have severe liver damage, acute liver disease, or have previously had a severe allergic reaction to either of its active components. Talk to your doctor before starting Isoniazid+rifampicin if you have a history of liver problems, kidney disease, diabetes, or nerve pain.
This medicine can interact with alcohol, significantly raising the risk of serious liver damage, and can reduce the effectiveness of hormonal birth control. If you are pregnant, breastfeeding, or planning a pregnancy, talk to your doctor or pharmacist to discuss the risks and benefits before starting treatment.
Uses of Isoniazid+rifampicin
Medicinal Benefits
Isoniazid+rifampicin helps treat tuberculosis by preventing the growth and spread of the bacteria responsible for the infection. By targeting the underlying cause of the disease, it supports recovery and helps improve symptoms over the course of treatment.
- Helps Relieve Tuberculosis Symptoms: As the infection comes under control, symptoms such as persistent cough, chest discomfort, fever, night sweats, and fatigue gradually improve, helping you regain strength and overall well-being.
- Supports Effective Tuberculosis Treatment: The combination of two anti-tuberculosis medicines works together to fight the infection more effectively, helping reduce the bacterial load and support successful treatment outcomes.
- Simplifies Long-Term Treatment: By combining two medicines into a single oral treatment, Isoniazid+rifampicin reduces the number of tablets you need to take each day. This convenience can help improve treatment adherence and support completion of the full course of therapy.
Directions for Use
- Take Isoniazid+rifampicin exactly as prescribed by your doctor. Do not change your dose or stop taking it without consulting them.
- Swallow the tablet whole with a full glass of water. Do not crush, chew, or break it.
- Take this medicine on an empty stomach, either 1 hour before or 2 hours after meals, to ensure the medicine is properly absorbed by your body.
- Keep taking this medication for the full length of time prescribed by your doctor, even if your symptoms disappear after a few weeks.
Storage
Side Effects of Isoniazid+rifampicin
Common Side Effects (Usually mild):
- Orange-red discolouration of urine, sweat, saliva, sputum, or tears
- Nausea, vomiting, or stomach upset
- Loss of appetite
- Mild tingling or numbness in the hands or feet
Serious Side Effects (Call a doctor right away):
- Signs of liver damage, such as yellowing of the skin or eyes, dark urine, pale stools, severe stomach pain, or persistent nausea
- Severe allergic reactions, including skin rash, itching, swelling of the face, lips, or throat, and difficulty breathing
- Unexplained fever, sore throat, or unusual bruising and bleeding
- Changes in vision, eye pain, or difficulty seeing colours
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Drug Warnings
- Expect your body fluids (urine, tears, sweat, saliva) to turn red-orange; this is a harmless side effect of the medicine.
- Avoid wearing soft contact lenses during treatment, as they may become permanently stained by your tears.
- Do not stop taking this medicine early, even if you feel completely better, to prevent the bacteria from becoming resistant to antibiotics.
- Use a non-hormonal method of birth control (such as condoms), as Isoniazid+rifampicin can make hormonal contraceptives like birth control pills, patches, or implants less effective.
- Attend all scheduled appointments for blood tests so your doctor can regularly monitor your liver function throughout your treatment.
Drug Interactions
Before using Isoniazid+rifampicin, it is important to understand how it may interact with other medicines, foods, or existing health conditions.
Drug-Drug Interactions
- Hormonal contraceptives: Isoniazid+rifampicin may reduce the effectiveness of certain hormonal contraceptives. Discuss appropriate contraceptive options with your doctor, who may recommend additional or alternative methods of birth control during treatment.
- Blood thinners (e.g., warfarin): This medicine may reduce the effectiveness of anticoagulants, potentially affecting blood clotting control. Your doctor may need to monitor your clotting parameters and adjust treatment if necessary.
- Anti-seizure medicines (e.g., phenytoin): Taking Isoniazid+rifampicin with certain anticonvulsants may alter the levels or effects of either medicine, potentially increasing the risk of side effects or affecting seizure control. Close monitoring may be required.
- Antifungal medicines (e.g., ketoconazole): Isoniazid+rifampicin may reduce the absorption and effectiveness of certain antifungal medications, which could make fungal infections more difficult to treat.
Drug-Food Interactions
- Foods high in tyramine or histamine (e.g., aged cheese, red wine, tuna): Consuming large amounts of these foods may increase the risk of symptoms such as flushing, itching, headache, palpitations, or a rapid heart rate in susceptible individuals.
Drug-Disease Interactions
- Liver disease: Use Isoniazid+rifampicin with caution if you have liver impairment. The medicine may worsen underlying liver conditions or increase the risk of liver-related side effects. Your doctor may recommend regular liver function monitoring during treatment.
- Diabetes: Isoniazid+rifampicin may affect blood glucose control, making blood sugar levels more difficult to manage. Patients with diabetes should monitor their blood sugar regularly and consult their doctor if significant changes occur.
- Gout: This medicine may increase uric acid levels in the blood, which can trigger or worsen gout attacks in susceptible individuals. Patients with a history of gout should discuss appropriate monitoring and management with their healthcare provider.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
unsafeAvoid alcohol consumption while taking Isoniazid+rifampicin as it could lead to increased drowsiness, dizziness and liver damage.
Pregnancy
cautionPlease consult your doctor if you are pregnant, your doctor will prescribe Isoniazid+rifampicin only if the benefits outweigh the risks.
Breast Feeding
unsafeIsoniazid+rifampicin passes into breast milk. Do not breastfeed while taking Isoniazid+rifampicin.
Driving
cautionIsoniazid+rifampicin may cause dizziness, drowsiness, numbness and tingling sensation in hands and feet. Do not drive or operate machinery if you experience these symptoms.
Liver
cautionDose adjustment may be needed. Please consult your doctor before taking Isoniazid+rifampicin if you have liver impairment/liver disease.
Kidney
cautionDose adjustment may be needed. Please consult your doctor if you have any concerns regarding this or if you have kidney impairment/kidney disease before taking Isoniazid+rifampicin.
Children
consult your doctorPlease consult your doctor. Your doctor may suggest suitable dose and dosage form based on your child's age, body weight and medical condition. Kid tablets could be used in children if prescribed by the doctor.
Habit Forming
Diet & Lifestyle Advise
- Avoid alcohol completely: Drinking alcohol while taking this medicine significantly increases the risk of serious liver damage.
- Avoid certain foods: Do not eat foods high in tyramine and histamine, such as aged cheeses, red wine, soy sauce, yeast extracts, and certain fish like tuna or mackerel. Combining these foods with this medicine can trigger flushing, sweating, a rapid heartbeat, or headaches.
- Take Vitamin B6 (pyridoxine) if recommended: Your doctor may advise taking a vitamin B6 supplement daily to help prevent nerve tingling or numbness caused by isoniazid.
- Stay hydrated: Drink plenty of water throughout the day to help your kidneys filter the medication safely.
Special Advise
Isoniazid+rifampicin may affect test results of some blood tests such as tests for folate, vitamin B12, and liver function. Inform the person doing the tests that you are taking Isoniazid+rifampicin.
Your doctor may advise you to get regular liver tests while taking Isoniazid+rifampicin to check how your liver is functioning.
Patients Concern
Disease/Condition Glossary
Tuberculosis (TB): Tuberculosis is an infectious disease that affects the lungs, but it could also spread to other body parts such as kidneys, brain, spine, and bone marrow. Tuberculosis is caused by a bacteria named Mycobacterium tuberculosis. It is a contagious disease which can spread to others through small droplets released into the air by a person suffering from tuberculosis. Symptoms include a cough that lasts for a few weeks, pain while coughing or with normal breathing, unexplained fatigue, fever, night sweats, loss of appetite and weight. People who smoke or consume alcohol, people diagnosed with HIV, and immune system problems are more likely at risk of developing active TB.
FAQs
Isoniazid+rifampicin is a combination of two anti-tuberculosis medicines, Rifampicin and Isoniazid, used to treat and prevent tuberculosis (TB). These medicines work together to kill Mycobacterium tuberculosis, the bacteria that causes TB.
Isoniazid+rifampicin is a combination of two anti-tuberculosis drugs, namely: Rifampicin, and Isoniazid. Rifampicin inhibits DNA-dependent RNA polymerase activity in the bacteria. Isoniazid inhibits the biosynthesis of mycolic acid, which is the major component of the cell wall. Together, Isoniazid+rifampicin kills Mycobacterium tuberculosis which causes TB (tuberculosis).
No. Do not stop taking Isoniazid+rifampicin even if your symptoms, such as cough, improve. Stopping treatment early may allow the bacteria to survive, causing the infection to return and increasing the risk of drug-resistant tuberculosis. Complete the full course prescribed by your doctor.
Do not take Isoniazid+rifampicin along with antacids as it might decrease the effectiveness of Isoniazid+rifampicin. Maintain a minimum gap of 1hour between both.
Consult your doctor before taking Isoniazid+rifampicin with other medicines. Medicines used to treat TB such as PAS (P-amino salicylic acid) and cycloserine should be taken 8hours apart from Isoniazid+rifampicin.
Isoniazid+rifampicin contains isoniazid which might interact with foods and drinks containing histamine or tyramine such as cured meat, matured cheese, soya, tuna, salmon, mackerel, wine, and beer. Avoid these foods while taking Isoniazid+rifampicin.
Yes. Isoniazid+rifampicin may reduce the effectiveness of hormonal contraceptives, including birth control pills, patches, rings, and implants. Use a reliable non-hormonal method of contraception, such as condoms, while taking this medicine. Consult your doctor for advice on suitable contraceptive options.
Isoniazid+rifampicin may cause discolouration of teeth, sweat, urine, sputum (phlegm), saliva, or tears. The colour in tears may last for some time even after you stop taking Isoniazid+rifampicin. Do not worry as it is a common side-effect of Isoniazid+rifampicin.
Yes, Isoniazid+rifampicin might permanently stain soft contact lenses. Use spectacles and avoid wearing contact lens while taking Isoniazid+rifampicin.
Isoniazid+rifampicin may affect test results of some blood tests such as tests for folate, vitamin B12, and liver function. Inform the person doing the tests that you are taking Isoniazid+rifampicin.
Yes, Isoniazid+rifampicin may cause liver problems, particularly in adults over 35 years of age. Watch for symptoms such as yellowing of the skin or eyes, dark urine, pale stools, loss of appetite, severe nausea or vomiting, weakness, or persistent pain in the upper right side of the abdomen. Seek medical attention immediately if these symptoms occur. Your doctor may recommend regular liver function tests during treatment.
Before using Isoniazid+rifampicin, you should learn about its use, side effects, and limitations.
If you forget a dose of Isoniazid+rifampicin, take it immediately when you remember. However, if your next dose is near, skip the missed dose and continue with your regular schedule. Never double dose to make up for a missed dose, as this may increase side effects.
Take Isoniazid+rifampicin on an empty stomach, preferably 1 hour before food or 2 hours after food, to ensure optimal absorption and effectiveness.
Store Isoniazid+rifampicin in a cool, dry place out of sunlight and children's reach. Check the expiration date regularly. To dispose of it, place it in a plastic bag and throw it away in household trash. Never flush it down the toilet or sink.
You should avoid alcohol while taking Isoniazid+rifampicin strictly to ensure safety and efficacy, as it can increase the risk of liver damage when combined with medications like Isoniazid and Rifampicin.
Common side effects of Isoniazid+rifampicin may include drowsiness, dizziness, headache, weakness, muscle pain, heartburn, diarrhea, gas, and numbness. However, these symptoms vanish as your body adjusts to the medication. If these symptoms become worse, please consult a doctor for relief.
Before using this medication, you should inform your doctor about your medical history, including any ongoing medicines, to avoid potential interactions and minimize side effects.
Taking more than the recommended dosage does not provide additional relief and can increase the risk of adverse effects.
Isoniazid+rifampicin is generally considered safe when used as prescribed by a doctor. However, like all medications, it can have side effects and potential interactions with other drugs. It's important to follow your doctor's instructions and inform them of any pre-existing and existing medical conditions or medication history to avoid negative complications.
Tingling or numbness in your hands or feet can be a sign of nerve irritation. Your doctor may prescribe a vitamin B6 (pyridoxine) supplement to help prevent or treat this issue. Talk to your doctor right away if you notice these symptoms.
If you are pregnant or planning to become pregnant, you must discuss the benefits and potential risks of this medication with your healthcare provider. Treating tuberculosis is very important during pregnancy, but it requires careful medical supervision. Talk to your doctor for personalised advice.
