Cameron said he was "deeply concerned" over the issue and his views had been made clear to Pakistani authorities.
Mohammad Asghar, from Edinburgh in Scotland, is being held in a high-security prison in the garrison city of Rawalpindi since he was sentenced last week.
He was arrested in 2010 in Rawalpindi for writing letters claiming to be a prophet. Asghar has lived in the UK for 40 years and still has family in the country.
"I too am deeply concerned about this death sentence passed on to Mohammed Asghar and, as you know, it's our long-standing policy to oppose the death penalty in all circumstances," he said during Prime Minister's Questions in answer to a question posed by Edinburgh East MP Sheila Gilmore.
"We take this extremely seriously and we're making that clear at every level," he said.
Cameron said Pakistani-origin Foreign Office Minister Baroness Sayeeda Warsi had contacted the chief minister of Punjab and the High Commissioner to Islamabad had raised the case with the relevant authorities.
Gilmore asked in Parliament: "I wrote to the Foreign Secretary yesterday, but can you now assure me that you and your ministers are doing everything they can to support this man and to see him returned to the UK where he can get the treatment he needs?"
Cameron replied: "I certainly can give you the assurance that you have asked for."
In Pakistan, several persons have been sentenced to death under the harsh blasphemy law though none of them have been executed so far. Pakistani rights groups have criticised the law, saying it is often used to settle personal scores or to persecute minorities.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
