Yes

Are there risks in case of drinking large amounts of a drug? 
Of course, and regardless of medications side effects , taking medications in overdoses is always harmful to the human body, which may lead to health risks such as:
1. Acute side effects
2. Gastrointestinal infections
3. Liver poisoning
4. Kidney failure
5. Failure of bowel movement
6. Loss of consciousness
7. Shortness of breath
8. Blood clots
9. Death
in such a case , what are the most appropriate steps?
This usually depends on the type of medication, the amount of taken medication, and the age of the patient , but in general, the following should be sone :
1. Know the medicine and the quantity intake 
2. Inform the doctor about the medicine taken and the expected dose
3. general examinations are performed for the patient
4. The condition is monitored for 6-24 hours
General advice:
1. Keep the medicine out of the reach of children or people who have previously taken medicines without medical necessity or in large quantities
2. Know more information about the medications at home, its risks and side effects