HUNDREDS of people in Scotland suffering from a potentially fatal lung disease are to be offered a new treatment on the NHS.

Patients with a rare condition that causes scarring of the lungs and makes breathing increasingly difficult will be able to access Pirfenidone on prescription within months.

The Scottish Medicines Consortium, the body that decides which drugs offer best value for money for NHS use, has approved it to treat mild-to-moderate idiopathic pulmonary fibrosis (IPF).

Pirfenidone, which is branded Esbriet, slows the decline in sufferers' lung tissue. It is priced at about £26,100 per full year of treatment, or about £8 per capsule in Scotland.

The drug is the only known treatment for the condition, which affects 500 to 800 people in Scotland. The illness worsens over time and is often fatal. Without treatment half of sufferers will die within three years.

The condition is difficult to diagnose because symptoms resemble those of other lung diseases, leading many sufferers to make repeat visits to the doctor and endure a string of misdiagnoses before the disease is finally identified.

Dr Nik Hirani, from Edinburgh University, said: "Pirfenidone is the only drug that has shown proven efficacy in IPF, a progressive and life-threatening condition.

"It is excellent news that the Scottish Medicines Consortium (SMC) has decided to make it available to patients in Scotland, as it is in other EU countries. This will ensure that, where clinically appropriate, patients will be rapidly provided with access to this treatment."

Rory Cameron, general manager for manufacturer InterMune UK and Ireland, said: "Patients in Scotland have previously not had access to any licensed medicines for the treatment of idiopathic pulmonary fibrosis. Making pirfenidone available within NHS Scotland is a great step forward in addressing a genuine unmet need for IPF patients."

Pirfenidone is already available on the NHS to patients in England and Wales after the National Institute For Health And Care Excellence approved the drug in March.

Meanwhile, the SMC has also approved another drug for use for sufferers of severe rheumatoid arthritis.

It accepted abatacept solution for subcutaneous injection, which is branded Orencia, for use within NHS Scotland. It can be used in combination with methotrexate, a disease-modifying anti-rheumatic drug, as a first-line biologic agent for adults with the condition.

The drug can also be used earlier in the treatment, providing doctors with greater treatment options and benefitting the patients who suffer from this disabling chronic disease.

Up to 217,000 people are affected by the condition in Scotland.