The Government Pharmaceutical Organisation (GPO) will deliver 4500 5ml bottles of cannabis oil to the Ministry of Public Health to be distributed to hospitals on August 7 for about 4000 registered patients, GPO executive managing director, Withoon Danwiboon, told a news conference on Thursday.

The remaining 5500 bottles will be gradually distributed later.

Thailand, which has a tradition of using cannabis to relieve pain and fatigue, has legalised marijuana for medical use and research to help boost agricultural incomes.

Cannabis oil will be used to treat patients who suffer from nausea from chemotherapy, epilepsy, and aches and pains, Withoon said, adding that patients with Parkinson's, Alzheimer's and in palliative care would also benefit.

The GPO will begin planting its second crop of cannabis plants later this month and by early 2020, it plans to expand production to greenhouse cultivation and aims to produce 150,000-200,000 bottles of the oil.

"We have to speed up production because there is an under supply," Withoon said.

For five years, foreign investors and imports of cannabis will be prohibited to allow the domestic industry to build up capacity and knowledge, he said.

Anutin Charnvirakul, a politician who campaigned for legalising marijuana and is now health minister, said in a separate statement on Thursday that cannabis must only be used for medical purposes, not for recreational ones.

Steps would be taken to allow public health volunteers to grow cannabis at home for health benefits, but it would not be allowed to be sold.

A new civilian government has said it has made developing the medical marijuana industry a top priority to create economic opportunities in rural areas.

Australian Associated Press