Importance of Humidity Control in Pharmaceutical Industry

Thus, precise humidity control is indispensable for guaranteeing the stability and efficacy of medications.

Drug Medicine Pharma manufacturing Factory Industry Unit
Picture: Pixabay
SDCO Cum Licensing Authority |
Food and Drugs Administration, (FDA) Haryana, India. |
Email ID:
Rakesh Dahiya

Last Updated on January 3, 2024 by The Health Master

Humidity Control

Humidity Control: In the dynamic landscape of pharmaceuticals, precision and control are paramount. One often overlooked yet crucial aspect of this control is humidity.

Maintaining the right levels of humidity can make all the difference in ensuring product quality, yield, and longevity.

This article delves into the vital role of humidity control in pharmaceuticals and sheds light on the best practices to implement.

Optimal Humidity Levels: A Game-Changer

The World Health Organization (WHO) advocates maintaining relative humidity levels at approximately 50%. Straying from this range, either higher or lower, can have adverse effects on pharmaceutical products. Here’s why:

1. Fungal Growth Prevention:

The WHO advises keeping relative humidity below 75% to thwart fungal growth within facilities.

2. Clean Room Necessity:

Clean rooms play a pivotal role in pharmaceutical operations.

They must maintain an adequate humidity level to prevent personnel discomfort due to high humidity and static buildup during low humidity periods.

According to the United States Pharmacopeia (USP) 797, relative humidity (RH) should be consistently below 60%.

Protecting Product Stability

1. Product Stability:

Many pharmaceutical products are moisture-sensitive. Thus, precise humidity control is indispensable for guaranteeing the stability and efficacy of medications.

Excess moisture can lead to the degradation of active ingredients or even trigger chemical reactions that render the drugs ineffective.

2. Quality Control:

To maintain the quality and uniformity of pharmaceutical products, precise humidity control is necessary.

Even minor deviations in humidity levels can lead to variations in drug formulations, which could be potentially harmful to patients.

3. Manufacturing Processes:

Pharmaceutical manufacturing encompasses various processes, including granulation, tablet compression, and coating.

The humidity level directly impacts the flow properties of powders and the integrity of tablet formulations.

Therefore, maintaining optimal humidity levels ensures consistent and high-quality production.

4. Storage Considerations

Proper humidity control in storage areas is paramount to preventing moisture-related issues like clumping, degradation, or microbial growth in pharmaceutical ingredients and finished products.

Without this control, valuable resources can be rendered unusable.

5. Packaging Protection

Pharmaceuticals necessitate appropriate packaging materials to shield them from moisture.

High humidity levels can compromise the integrity of packaging, leading to leaks or contamination.

6. Regulatory Compliance

Regulatory agencies, such as the FDA, mandate that pharmaceutical companies adhere to strict quality standards.

Humidity control is a fundamental aspect of good manufacturing practices (GMP) and is meticulously scrutinized during inspections.

7. Laboratory Testing

Laboratories in pharmaceutical industries require controlled humidity levels for precise testing and research.

Any variations in humidity can potentially skew the results of stability studies and analytical tests, jeopardizing the accuracy and reliability of the findings.

8. Cleanroom Environments

In sterile pharmaceutical manufacturing, cleanroom environments with controlled humidity are indispensable to prevent contamination and uphold product purity.

Beyond this, controlled humidity can also:

  • Reduce the risk of electric shock that can damage equipment.
  • Diminish the presence of dust in the environment.
  • Safeguard storage boxes from damage.


AreaRecommended Relative Humidity (RH) Range
General Manufacturing Areas40%–60%
Clean Rooms (Non-Sterile)Below 60%
Clean Rooms (Sterile)45%-55%
Packaging Areas40% – 55%
Storage Areas (Raw Materials)40%–60%
Storage Areas (Finished Goods)40%–50%
Stability Testing Chambers40%–60%
Aseptic Processing Areas45%-55%
Controlled Environment Chambers45%-55%


Pharmaceutical product typeIdeal humidity range
Antibiotics40-50% RH
Vaccines50-60% RH
Tablets40-50% RH
Capsules40-50% RH
Injectable medications50-60% RH

Note: Please note that these are general recommendations and may vary based on specific pharmaceutical processes, local climate conditions, and regulatory requirements. It’s essential for pharmaceutical companies to conduct thorough assessments and validations to determine the precise humidity levels required for their specific operations.

Compiled by:
Rakesh DahiyaSDCO cum Licensing Authority, FDA Haryana

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