Half of bosses in the Republic have disciplined their staff for being under the influence of alcohol at work.
A study of 1,500 employers and employees also found that almost 70pc of companies have no specific policy on the issue in their workplace.
The survey by employment law firm, Peninsula Ireland, also found that eight in 10 workers admitted indulging in a 'liquid lunch' at least once a week.
The study involved 1,021 employees and 472 employers across several industries.
Peninsula Ireland managing director Alan Price pointed out that the 'liquid lunch' is still present in the workplace and this could spell trouble for both Irish employers and workers.
"Employers need to take a tough stance on their workers drinking during the working day and tackle the problem head on," Mr Price said.
"Employees who are under the influence of alcohol are not in a fit state to perform their duties and this has an adverse effect on productivity.
"People are affected by alcohol in different ways so there shouldn't be a tolerated level of drinking during the week."
The employment law firm said there should be clear codes of conduct in relation to alcohol consumption in each workplace.
"Employers need to understand the health & safety implications of allowing an employee to be under the influence of alcohol in the workplace," added Mr Price.
"They pose a potential danger not only to themselves but also to their colleagues and the problem is especially shocking considering some of the industries that were questioned.
"It is potentially life threatening in jobs where heavy machinery is used."
He added: "Irish employees should remember that they are getting paid to do a job and realise that it is inappropriate to consume alcohol during the working day. Workers should be wary of their own behaviour and also consider the company's reputation."