Medicines & Supplements A to Z > Lignocaine


Last updated on 01/07/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Lignocaine


CHINESE NAME: 里格卡因, 利多卡因

BRAND NAME(S) IN HONG KONG: Xylocaine 苦息樂卡因

DRUG CLASS: Analgesics

SUB CLASS: Local anesthetics

USED FOR: Pain management, surgical anaesthesia

– 10% (spray)
– 2% (gel)
– 1%, 2% (injections)

What is Lignocaine for?

Lignocaine belongs to a class of medications called local analgesics. It works by blocking nerve signals of pain in your body and is therefore used to reduce itching and pain in skin conditions such as minor burns and insect bites, and for symptomatic pain relief in anorectal areas during hemorrhoids and anal fissure. Lignocaine is also used in invasive medical procedures including endoscopy, cystoscopy and surgeries, and in dental practices.

How to use it?

Lignocaine is applied topically to the affected area as spray or gel. If you use the gel, clean and dry the affected area and apply a thin layer to the affected area as directed. If you are using the spray, shake the canister well before using. The amount of Lignocaine to be applied depends on the size of the affected area. Avoid applying the medication to open wounds. Wash your hands after applying the medication. The maximum dosage for topical application is 4.5 mg/kg body weight, and should not exceed 300 mg per dose.

What are the side effects of Lignocaine?

Common side effects of Lignocaine include numbness, swelling and itchiness in the applied area, nausea and dizziness.

Who should not take Lignocaine?

People allergic to Lignocaine or any component of the formulation.

Pharmacist Tips:

– Do not use it on large areas of the body and do not apply more than the prescribed dosages as overuse can increase the risk of serious side effects and toxicity.
– Patients who administered local anesthetics by injections are at increased risk of developing methemoglobinemia. If you experience symptoms like rapid heart rate, shortness of breath and fatigue, report to your doctor immediately.

Common dosing schedule:
For medical procedures, apply lignocaine several minutes before the procedure.
For pain relief, apply 3 to 4 times daily to affected areas.

Some common medications Lignocaine may interact with:
Lignocaine may increase your risk of developing methemoglobinemia when concurrently using the following drugs:
– Other local anesthetics, e.g. Articaine, Bupivacine, Procaine, Prilocaine
– Nitrates, e.g. Nitroglycerin, Nitric oxide, Isosorbide Mononitrate and Dinitrate
– Antibiotics, e.g. Dapsone, Sulfonamides
– Anticonvulsants, e.g. Phenobarbital, Phenytoin, Sodium Valproate
– Acetaminophen, Metoclopramide, Sulfasalazine

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Lignocaine in Hong Kong?

In Hong Kong, Lignocaine gel is a medicine under supervised sales and can be purchased under the supervision of a pharmacist from any pharmacies in Hong Kong. Lignocaine injection is a prescription drug. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health. 

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Lignocaine in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.