The number of people treated with antidepressants has increased by almost 5% in the last year, according to new figures.

Official statistics show the drugs were dispensed to 814,181 patients in Scotland during 2014/15, up from 778,180 in 2013/14.

A rise of 28.5% has been recorded since 2009/10, when 633,791 people were treated with antidepressants.

Around two-thirds (66.4%) of the patients who received the drugs in the last year were female, with the peak age between 50-54 years.

Antidepressant treatment also increased with deprivation, with 225,969 patients in the poorest parts of Scotland receiving the drugs, compared to 110,507 in the least deprived areas.

Despite a rise in the number of prescriptions, the total cost of the drugs has fallen by 30.5% between 2004/05 and 2014/15, from £58.7 million £40.8 million.

Statisticians point out that many drugs classified as antidepressants can be used to treat other conditions such as post-traumatic stress disorder and anxiety.

Opposition parties called on the SNP Government to invest more in alternative therapies and treatment options.

Conservative health spokesman Jackson Carlaw MSP said the increase in antidepressant use was "extremely alarming".

"Years ago the SNP pledged to stop this rise, yet it hasn't even been able to make a dent in it," he said.

"We are now looking at the flabbergasting statistic of more than one in seven people in Scotland being prescribed antidepressants this year.

"There's no doubt these drugs have a place in addressing mental health issues.

"But we urgently have to look at better alternatives than simply parking people on medication in the hope things don't get any worse, with no aspiration for complete recovery."

Liberal Democrat health spokesman Jim Hume MSP said: "The fact that we have seen such substantial increases in prescriptions raises real concerns over whether this reflects shortages in other services.

"We need to ensure that doctors across Scotland are able to refer patients to the services that offer them the best chance of recovery. If doctors are prescribing anti-depressants because they feel they have no other option then this is a real problem.

"These figures should raise a red flag for SNP ministers. They underline the need for greater investment in mental health services across Scotland."

Mental Health Minister Jamie Hepburn said: "Any prescribing is a clinical decision for a patient's doctor and there is good evidence that GPs assess and treat depression appropriately.

"We have seen more people being prescribed antidepressants as a result of reduction in stigma attached to mental health, and better diagnosis and treatment of depression by GPs.

"This sits alongside a 17.8% drop in suicide rates in Scotland between the periods 2000-2004 and 2010-2014.

"We are also committed to improving access to alternatives, such as psychological therapies, that increase choice and best accommodate patient preference."