Low-Substituted Hydroxypropyl Cellulose (L-HPC) is a multi-functional pharmaceutical excipient for oral solid preparations, primarily applied as high-efficiency disintegrant and binder, complying with pharmacopoeia specifications with mature application history.

I. Core Functions & Mechanisms

1. Disintegrant (Primary Application)

It rapidly absorbs water and swells by 3~5 times. Combined with capillary action, the swelling force enables quick tablet disintegration, accelerates drug dissolution and improves bioavailability; typical dosage ranges from 2% to 5%.
Merits: Slightly affected by tableting pressure; tablets with high hardness still disintegrate rapidly, superior to starch-based disintegrants.

2. Binder & Filler

Its irregular granular surface interlocks with drug powder to boost tablet hardness and avoid capping or splitting. For wet granulation, addition level is 2%~20%, ideal for poorly compressible drugs.

3. Auxiliary Functions

Improve powder flowability and compactibility for direct compression; chemically stable with good compatibility with most pharmaceutical active ingredients.

II. Main Application in Dosage Forms

1. Conventional Oral Tablets (Most Widely Used)

Applied in antipyretic analgesics, antibiotics, synthetic drug tablets and traditional Chinese medicine tablets via intra-granular addition, extra-granular addition or combined addition.

2. Orally Disintegrating Tablets (ODT)

Disintegrate rapidly upon contact with saliva without drinking water, suitable for the elderly, children and patients with swallowing difficulties.

3. Capsules & Granules

Facilitate granule formation, prevent agglomeration and assist disintegration and drug release.

4. Sustained/Controlled Release Preparations, Pellets & Extrudates

Modulate drug release rate for matrix sustained-release tablets and extrusion-spheronization pellets.

5. Chewable Tablets & Effervescent Tablets

Balance mouldability, taste and disintegrating performance.

III. Common Pharmaceutical Grades Selection

• LH-11: Large particle size, anti-capping property, mainly for direct compression
• LH-21: General-purpose grade, preferred for wet granulation tablets (binder + disintegrant dual functions)
• LH-31: Fine particle size, for pellets and extrusion preparations

IV. Application Characteristics

• Applicable processes: wet granulation, direct compression, dry granulation
• Administration route: oral only; non-toxic, non-irritant with high safety
• Compatibility: Can be compounded with crospovidone and croscarmellose sodium to enhance disintegration effect

V. Summary

L-HPC is a cost-effective multi-functional excipient for oral solid dosage forms featuring rapid disintegration and hardness enhancement. It is a core widely-used excipient in modern pharmaceuticals covering conventional tablets, ODT, capsules, granules and sustained-release products