Pharmaceutics Formulation & R&D Laboratory
Design, compress, and run quality control tests on virtual pharmaceutical tablets to study physical properties and drug release metrics.
Choose Active Pharmaceutical Ingredient (API)
Select the drug substance to formulate. Each has distinct crystallization and density profiles.
Select Excipient System Components
Excipients are vital inactive compounds added to ensure stability, proper disintegration, and binding strength.
Real-time Powder Blend Diagnostics
Scientific SOP & Formulas
Live Formulation Recipe Advisor
1. Carr's Index & Flowability
Measures powder bridge-strength and ease of flow in the feed hopper.
Where: ρt = Tapped density, ρb = Bulk density
| Index (%) | Flow Habit |
|---|---|
| < 10% | Excellent |
| 11 - 15% | Good |
| 16 - 20% | Fair (Needs glidant) |
| 21 - 30% | Poor (Needs dry gran.) |
| > 30% | Very Poor / Fluffy |
Glidant selection: Use Colloidal Silicon Dioxide (Aerosil) for fluffy/cohesive powders to reduce index by up to 25%, or Talc to reduce index by 15%.
2. Noyes-Whitney (Dissolution)
Controls the rate of drug dissolution and release in gastrointestinal fluid.
D: Diffusion coefficient.
A: Tablet Surface Area (Granulation increases effective surface wetting).
h: Boundary layer thickness.
Cs: Saturation solubility of active ingredient.
Cb: Bulk solution concentration.
Dissolution Modifiers: Magnesium Stearate is hydrophobic and creates a water barrier around insoluble drugs (Class II/IV). To bypass this barrier, add Sodium Lauryl Sulfate (SLS) wetting surfactant, or replace Magnesium Stearate with hydrophilic Sodium Stearyl Fumarate (SSF).
3. Biopharmaceutics Classification (BCS)
Predicts drug absorption based on solubility and intestinal permeability parameters.
| BCS Class | Solubility | Permeability |
|---|---|---|
| Class I | High Solubility | High Permeability |
| Class II | Low Solubility | High Permeability |
| Class III | High Solubility | Low Permeability |
| Class IV | Low Solubility | Low Permeability |
Design Hint: Class II and IV drugs require dissolution optimization (superdisintegrants) and wetting agents (SLS) to improve dissolution.
4. USP Pharmacopeial Standards
• Hardness: 4.0 - 10.0 kN crushing force.
• Friability: < 1.0% mass loss under mechanical stress.
• Weight Variation: USP Chapter <905> weight uniformity. RSD < 5.0% for 10 tablets.
• Content Uniformity: USP Chapter <905> active content. RSD < 6.0% for 10 tablets. Required for low-dose drugs (≤ 5mg).
• Dissolution: > 75% API release at 30 minutes. Enteric/acid-labile drugs must not degrade in gastric stage (pH 1.2).
5. Excipient Limits & Concentration Range
Typical concentration weight ranges in oral solid dosage forms:
• Diluents (MCC, Lactose): 20.0% - 90.0% (Fill tablet volume).
• Dry/Wet Binders (PVP K30): 2.0% - 10.0% (Strengthen matrix).
• Disintegrants (Croscarmellose): 2.0% - 8.0% (Induce swelling).
• Glidants (Aerosil): 0.1% - 1.0% (Reduce interparticle friction).
• Lubricants (Mg Stearate, SSF): 0.25% - 2.0%. Over-lubrication (> 2.0%) forms a hydrophobic shell, retarding dissolution.
• Surfactant Wetting Agents (SLS): 0.5% - 2.0% (Improve hydrophobic drug wetting).
6. Formulation Decision Guide
• High-Dose / Poor Flow (e.g. Paracetamol, Metformin, Ciprofloxacin): Direct compression will fail weight uniformity and block dies. Use **Wet Granulation** with **PVP K30** binder to create uniform granules.
• Heat / Moisture Sensitive (e.g. Aspirin, Vitamin C, Amoxicillin): Moisture/heat during oven drying causes hydrolysis/degradation. Use **Direct Compression** (with MCC binder) or **Dry Granulation** (roller compaction).
• Acid-Labile Drugs (e.g. Omeprazole, Pantoprazole): Instantly degrade in stomach acid (pH 1.2 medium). Add **Sodium Carbonate** basic buffer to protect active molecules from acid degradation.
• Low-Dose Uniformity (e.g. Diazepam, Digoxin, Folic Acid): Risk of powder segregation. Avoid coarse fillers like Dextrose; use **MCC** or **Lactose** direct fillers, or run **Wet Granulation** to lock particles in granules.
7. Compaction Process Physics
• Compression Force: Target range 5.0 - 12.0 kN. Force < 5.0 kN causes soft, friable tablets. Force > 15.0 kN causes structural shearing, air entrapment, and capping/lamination.
• Turret Speed: Target speed 10 - 30 RPM. Turret speed > 45 RPM reduces dwell time under the roller, preventing proper bonding (lamination risk) and blocking hopper mass flow.