Medicines & Supplements A to Z > Gabapentin


Last updated on 22/03/2021.

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

GENERIC NAME: Gabapentin 


BRAND NAME(S) IN HONG KONG: Gabapentin Teva, Neuran, Neurontin 

DRUG CLASS: Anticonvulsant; GABA analog

USED FOR: Focal seizures, neuropathic pain, migraine prevention, hot flushes


AVAILABLE DOSAGE FORMS: 100mg, 300mg, 400mg (capsules)

What is Gabapentin for?

Gabapentin belongs to a group of medications called anticonvulsants. It works by reducing the pain signals sent out from the damaged nerves and can be used as adjunctive therapy or monotherapy for focal seizures, neuropathic pain, prevention of migraines, and menopausal symptoms, particularly hot flushes in women.

How to use it?

Gabapentin can be taken orally as tablets or capsules. The dosages for some different uses are listed below:

For neuropathic pain



Day 1: 300 mg once daily

Day 2: 300 mg twice daily

Day 3: 300 mg 3 times daily 


Day 1: 300 mg 3 times daily

Then increase 300 mg every 2-3 days in 3 divided doses 

Dosage should be adjusted according to response and the maximum dose is 3.6 g per day


For prevention of migraine 



300 mg daily, then increase to up to 2.4 g daily in divided doses; Adjust the dosage according to response


For menopausal symptoms, particularly hot flushes



300 mg 3 times daily, the initial dose should be lowered and titrated up over three days

What are the side effects of Gabapentin?

Common side effects of Gabapentin include swelling of the arms and legs, weight gain, dizziness and drowsiness, and dry mouth.

Who should not take Gabapentin?

– People who are allergic to Gabapentin or any ingredient of the formulation
– Children under the age of 6
– Pregnant or breastfeeding women and those who intend to become pregnant

Pharmacist Tips:

– It usually takes a few weeks for Gabapentin to work.
– Stop taking Gabapentin and seek medical attention straight away if you have symptoms like swollen skin, difficulty breathing and rash.
– Gabapentin can impair mental alertness. Do not drive until you know how Gabapentin affects you.
– Do not discontinue Gabapentin suddenly on your own as it can increase the risk of seizure.

Common dosing schedule:
Gabapentin can be taken with or without food.

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Gabapentin may interact with:
– Antidepressants, e.g. Amitriptyline, Fluoxetine
– Non-steroidal anti-inflammatory drugs (NSAIDs), e.g. Diclofenac, Ibuprofen, Naproxen
Opioid drugs, e.g. Codeine, Fentanyl, Methadone, Morphine, Oxycodone, Tramadol, Pethidine

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

Where to buy Gabapentin in Hong Kong?

In Hong Kong, Gabapentin is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. 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 Gabapentin 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.