NOEL is “No Observed Effect Level” of any pharmaceutical drug. It is determined to calculate the MACO (Maximum Allowable Carry Over) in cleaning validation. NOEL is the amount of drug in mg that does not have any effect on the human health.
NOEL is calculated by using Lethal Dose 50 (LD50) of the drug. Lethal Dose 50 is the amount of drug that kills the 50% population of the animals used in the test.
NOEL = (LD50 x 70kg)/2000
LD50 – Lethal Dose
70kg – Average adult weight
2000 – Constant
For Example: If any drug has LD50 331 mg/kg, then its NOEL will be calculated as below.
NOEL = 331x70/2000
= 11.58 mg
Now this value of NOEL is used to calculate the MACO (Maximum Allowable Carry Over)
MACO = (NOEL x MBS)/ (SF x TDD)
MBS – Maximum Batch Size
SF – Safety Factor (1000 for oral drugs)
TDD – Total Daily Dose of Next Product
For Example: If Total Daily Dose of the next product is 500 mg and batch size is 400 kg then MACO can be calculated as below.
MACO = (11.58 mg x 400000000 mg)/(1000 x 500 mg) -------- 400 kg = 400000000 mg
= 9264 mg
= 9.264 gm
Related: Cleaning Validation Sample Protocol
Ankur Choudhary is India's first professional pharmaceutical blogger, author and founder of Pharmaceutical Guidelines, a widely-read pharmaceutical blog since 2008. Sign-up for the free email updates for your daily dose of pharmaceutical tips.
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