Ministry of Health director-general of health Dr Ashley Bloomfield has confirmed the latest coronavirus case, the fourth in New Zealand, attended a Tool concert at Auckland's Spark Arena on Friday night.

Customers will face limits on the amount of Government-funded paracetamol they can get as a global drug shortage looms in the wake of the coronavirus crisis.

The new restrictions come into force on Monday, but don't apply to over-the-counter pills.

It comes after India - the world's biggest supplier of generic drugs - placed restrictions on the export of 26 products and medicines earlier this week.

And suppliers are warning of future shortages, with disruptions due to manufacturing or transportation.

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KAMRAN JEBRELLI/AP People wear face masks during the Middle East Comic Con in Dubai, United Arab Emirates, Thursday, March 5, 2020. The Middle East Film & Comic Con has begun in Dubai, a city of skyscrapers and nightclubs suddenly subdued by the outbreak of the new coronavirus across the region. (AP Photo/Kamran Jebreili)

Over 365 million funded paracetamol tablets are dispensed each year. It is a widely-used pain reliever.

Pharmac said the limits only apply for paracetamol prescribed by a doctor. And they said there is enough stock to meet four months of demand.

Dispensing will be monthly, rather than three monthly. But the restrictions won't apply in chronic cases.

Pharmac's director of operations Lisa Williams said the outbreak of Covid-19 meant it was inevitable there would be disruption to supply chains. "The first we are seeing of this is paracetamol," she said.

STUFF 020420 News Photo. STUFF Supermarkets in New Plymouth are feeling the effects of the coronavirus. Hand sanitizer is sold out across the district and other items are in strong demand. Limits were in place at countdown.

In a statement after questions from Stuff, Pharmac said they were advised international manufacturing sites for the raw material ingredients for paracetamol have been closed due to quarantine and other restrictions connected with coronavirus.

"It is important that access to the stock we have is carefully managed to ensure that all New Zealanders who need funded paracetamol over the coming months will have access to it.

"The temporary dispensing limits will allow the contracted supplier, and potentially other suppliers if necessary, time to get additional stock, until normal supplies of the raw material resumes."

Williams said limits to the supply of paracetamol was a global issue "and we don't know yet when normal supply of this raw material will resume".

Pharmac said a large number of medicines imported to New Zealand have some or all of their manufacturing and production steps in China.

The agency said the majority of its suppliers have contingency plans in place and "are actively managing their supply chains".

But some medicine suppliers have advised they anticipate future disruptions due to supply issues. More temporary restrictions on dispensing volumes may follow.

Suppliers are required to keep a two-month supply of stock in the country and there is typically another four to six weeks' worth of stock in New Zealand across the wholesale and retail supply chain.