Effects of lactic acid ingestion
No, don't drink it... And here's why.

Ingesting lactic acid or for some reason having too much of it in your body can cause a variety of health problems ranging from mild to deadly. There are two types of lactic acidosis; the first is called metabolic acidosis and the second is known as respiratory.

Metabolic acidosis - which is what would be caused by ingestion - occurs when the fluids in your body build up too much of the acid and your kidneys can no longer keep up with the demand placed on them. Or they over respond and remove too much base from your body, leaving you acidic.

Respiratory acidosis is caused when your lungs cannot effectively remove CO2 from the blood. A buildup of CO2 leads to a more acidic body chemistry.

Regardless of what the cause of the acidosis was, you can expect some of the following.

Symptoms of metabolic acidosis:

~Rapid and shallow breathing

~Confusion

~Fatigue

~Headache 

~Sleeplessness 

~Lack of appetite

~Severe acidosis can cause shock, organ failure and even death

Diagnosis of acidosis:

A series of blood tests will check calcium, sugar and electrolyte concentrations in your blood.  

My sources for this information:

Healthline

WikiPedia on Lactic Acidosis