Halothane
About Halothane
Halothane is an inhaled general anaesthetic used to produce and maintain unconsciousness during surgery and other procedures requiring general anaesthesia. Halothane is used less commonly in many countries today because newer inhaled anaesthetics are available, but its availability and use vary by country and healthcare setting.
This medicine acts on the brain and spinal cord to produce a controlled state of unconsciousness and reduce awareness and perception of pain during a procedure. The exact way halothane produces general anaesthesia is not fully understood. Your anaesthetist will decide whether it is appropriate based on the procedure, available anaesthetic options, and your individual health needs.
This medicine is given as a vapour that you breathe through a mask or airway device under the supervision of an anaesthetist or other appropriately trained healthcare professional. The amount is carefully adjusted throughout the procedure while your breathing, heart rate, blood pressure, oxygen levels, and other vital signs are monitored.
Some people may experience nausea, vomiting, shivering, drowsiness, or confusion while recovering from general anaesthesia. Halothane can also affect blood pressure and heart rhythm and can make the heart more sensitive to the effects of certain substances such as catecholamines. Rare but serious risks include severe liver injury and malignant hyperthermia, a dangerous reaction to certain anaesthetics.
Before receiving this medicine, tell your medical team about all medicines you take and any previous reactions to anaesthesia. Tell your anaesthetist if you have liver disease, heart or heart rhythm problems, pheochromocytoma, thyroid problems, myasthenia gravis, or a personal or family history of malignant hyperthermia. Also tell them if you are pregnant, breastfeeding, or are an older adult, as these factors may affect the choice and management of anaesthesia.
Uses of Halothane
Medicinal Benefits
When selected by the anaesthesia team, Halothane can help provide the controlled level of general anaesthesia needed for a surgical procedure.
- Maintains unconsciousness: It can help keep you unconscious during surgery so the procedure can be performed without awareness.
- Supports pain control during surgery: As part of an anaesthetic plan, it reduces the perception of painful surgical stimulation while you are unconscious.
- Allows controlled anaesthesia: The amount delivered can be adjusted by the anaesthesia team according to your response and the requirements of the procedure.
Directions for Use
- Follow your doctor’s instructions on the dosage and timing of this medication to ensure safety.
- Halothane will be administered by a doctor or healthcare professional.
- Do not self-administer.
Storage
Side Effects of Halothane
Common Side Effects (Usually Mild)
- Nausea or vomiting after the procedure
- Shivering or feeling cold
- Temporary drowsiness or confusion
- Low blood pressure during anaesthesia
Serious Side Effects (Consult your doctor right away)
- Yellowing of the skin or eyes, dark urine, or unusual tiredness, which may be signs of liver problems
- A rapid rise in body temperature, muscle rigidity, or other signs of malignant hyperthermia
- Severe or abnormal heart rhythm changes
- Difficulty breathing or severe wheezing
Drug Warnings
- Mention previous anaesthetic reactions: Tell your anaesthetist about any serious reaction you or a family member has had to general anaesthesia, particularly malignant hyperthermia.
- Discuss previous liver problems: Tell your doctor if you have liver disease or previously developed unexplained liver problems after an anaesthetic. Rare severe liver injury associated with halothane can occur even after a first exposure, although previous exposure can increase the risk.
- Share heart conditions: Halothane can affect heart rhythm and make the heart more sensitive to catecholamines. Tell your anaesthetist if you have heart disease, an abnormal heart rhythm, or take medicines that affect your heart or blood pressure.
- Mention adrenal or thyroid conditions: Tell your anaesthetist if you have pheochromocytoma or a thyroid disorder, as these conditions may affect cardiovascular responses during anaesthesia.
- Provide a complete medicine list: Tell your healthcare team about all prescription medicines, over-the-counter medicines, vitamins, supplements, and herbal products you use.
- Follow recovery instructions: Remain in the recovery area until your healthcare team considers you ready for discharge and follow their instructions about activities, food, medicines, and supervision after the procedure.
Drug Interactions
- Catecholamines and related medicines (e.g. epinephrine/adrenaline): Halothane can make the heart more sensitive to catecholamines, which may increase the risk of abnormal heart rhythms. The anaesthesia team carefully controls their use when needed.
- Beta-blockers (e.g. propranolol, metoprolol, or atenolol): These medicines may add to effects on heart rate or blood pressure during anaesthesia. Your anaesthetist will monitor your cardiovascular response closely.
- Bronchodilators (e.g. theophylline or aminophylline): These medicines may increase the risk of abnormal heart rhythms when used with halothane, so additional monitoring may be required.
- Opioids and sedatives (e.g. morphine, fentanyl, diazepam, or midazolam): These medicines can add to the effects of general anaesthesia, including reduced alertness and breathing. The anaesthesia team adjusts doses and monitors you closely.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
unsafeYou are recommended to avoid alcohol consumption while taking Halothane.
Pregnancy
cautionHalothane should be used in pregnant women only if clinically needed, and the benefits outweigh the risks. So, inform your doctor before receiving the Halothane if you are pregnant or planning for pregnancy. Your doctor will prescribe only if the benefits outweigh the risks.
Breast Feeding
unsafeHalothane is excreted into the breast milk. Breastfeeding should be stopped for 24 hours after halothane anaesthesia.
Driving
unsafePatients should not drive or operate heavy machinery for at least 24 hours after receiving halothane.
Liver
cautionCaution should be exercised while using Halothane in patients with liver impairment. So, inform your doctor before receiving the Halothane if you have a liver impairment/disorder history. Your doctor will prescribe only if the benefits outweigh the risks.
Kidney
cautionCaution should be exercised while using Halothane in patients with Kidney impairment. So, inform your doctor before receiving the Halothane if you have a kidney impairment/disorder history. Your doctor will prescribe only if the benefits outweigh the risks.
Children
cautionChildren under 18 years of age undergoing dental procedures outside the hospital are not recommended to use.
Habit Forming
Diet & Lifestyle Advise
- Follow fasting instructions: Follow the exact instructions from your healthcare team about when to stop eating and drinking before your procedure. Fasting requirements can vary depending on what you consume and your individual circumstances.
- Arrange transport home: If you are discharged on the same day, arrange for a responsible adult to take you home and follow your healthcare team's instructions about supervision after anaesthesia.
- Rest during recovery: Anaesthesia can temporarily affect coordination, judgement, and alertness. Follow your medical team's advice about driving, operating machinery, working, or making important decisions after your procedure.
- Resume fluids and food as advised: Start drinking and eating again when your healthcare team says it is appropriate, particularly if you have nausea after the procedure.
- Avoid alcohol and non-prescribed sedatives: Follow your healthcare team's advice about when it is safe to resume alcohol or medicines that can cause drowsiness after anaesthesia.
Patients Concern
Disease/Condition Glossary
Pain is not a disease but a symptom triggered by the nervous system, causing uncomfortable sensations in the body. Pain may be dull or sharp; it might be constant or intermittent. The tolerance level of pain might vary from person to person. Pain can be generalized (overall body aches) or localized (affecting a specific body area). Pain can be considered a good thing as it helps us know something is wrong in the body and helps diagnose the condition. The common causes of pain include headache, muscle strain, cramps, cuts, bone fractures, arthritis and stomach aches.
FAQs
Halothane is used for the induction and maintenance of general anaesthesia.
Halothane may affect your heart rhythm. Disturbances of the heart rhythm are very common. Your anaesthetist will quickly deal with any problems that arise during your operation.
Exposure to halothane within three months should be avoided unless there are strong reasons. Your anaesthetist will weigh the benefits and the risks.
Halothane is used less commonly in many countries today because newer inhaled anaesthetics, such as sevoflurane, desflurane, and isoflurane, are available. Its availability and use vary between countries and healthcare settings. Your anaesthetist will select an anaesthetic based on your health, the procedure, available options, and other clinical factors.
This medicine suppresses activity in the brain and spinal cord, producing unconsciousness and reducing awareness and perception of pain. The exact cellular mechanisms responsible for halothane's anaesthetic effects are not fully understood.
Follow the fasting instructions provided by your healthcare team. You may need to stop certain foods and drinks for a period before general anaesthesia to reduce the risk of stomach contents entering your lungs while you are unconscious.
General anaesthesia is intended to keep you unconscious and prevent awareness of the surgical procedure. Your anaesthesia team may use several medicines together to provide appropriate anaesthesia and pain control during surgery.
Rarely, halothane can cause serious liver injury, sometimes called halothane hepatitis. Severe liver reactions can occur even after a first exposure, particularly in adults, although previous exposure to halothane can increase the risk. Tell your doctor about liver problems or previous reactions to anaesthesia.
You will usually begin waking within a relatively short period after the anaesthetic is stopped, but recovery time varies depending on the amount and duration of anaesthesia, other medicines used, the procedure, and your individual response. Your anaesthesia team can explain what to expect for your procedure.
Nausea and vomiting can occur after general anaesthesia. Your healthcare team will assess your risk and may give anti-nausea medicines before, during, or after surgery to help prevent or treat these symptoms.
Malignant hyperthermia is a rare but serious inherited reaction to certain anaesthetic medicines, including halothane. It can cause muscle rigidity, a rapid rise in body temperature, and other dangerous changes. Tell your anaesthetist if you or a family member has had malignant hyperthermia or a serious unexplained reaction to anaesthesia.
Tell your anaesthetist about all medicines and supplements you use, allergies, previous reactions to anaesthesia, and your medical conditions. In particular, mention liver disease, heart or heart rhythm problems, pheochromocytoma, thyroid disease, myasthenia gravis, and any personal or family history of malignant hyperthermia.
Halothane has historically been used in children, but newer inhaled anaesthetics are commonly preferred in many healthcare settings today. A paediatric anaesthesia specialist will choose the most appropriate anaesthetic based on the child's health, procedure, and available options.
Do not drive or operate machinery until your healthcare team says it is safe. General anaesthesia and other medicines used during surgery can temporarily affect alertness, coordination, judgement, and reaction time. Follow the discharge instructions provided by your healthcare team.
