How Special Sugars Make Medicines Dissolve Better

This patent describes how to make poorly water-soluble drugs dissolve and absorb better by mixing them with specially modified, non-crystalline sugar molecules called cyclodextrin derivatives.

What it covers

The patent describes a way to create a stable drug mixture that helps medicines dissolve in the body. It starts with a special type of sugar molecule, called a cyclodextrin derivative, which has been chemically changed to be water-soluble and non-crystalline (amorphous). These modified cyclodextrins are dissolved in water (Claim 1, step 1). Then, a drug that doesn't dissolve well in water, like a hormone such as testosterone (Claim 5), is added to this solution. The cyclodextrins wrap around the drug molecules, forming a "solubilized drug/cyclodextrin complex" (Claim 1, step 2) that dissolves much better. This improved dissolution helps the body absorb the medicine more effectively. The resulting complex can be dried into a powder (Claim 2) or used in liquid form (Claim 11).

What it doesn't cover

• —Does not cover using cyclodextrins that are not chemically modified derivatives (e.g., plain alpha, beta, or gamma cyclodextrins).
• —Does not cover drug-cyclodextrin complexes that are crystalline rather than amorphous.
• —Does not cover drugs that are already highly water-soluble.
• —Does not cover methods where the cyclodextrin mixture is not intrinsically amorphous before complexing with the drug.
• —Does not cover cyclodextrin derivatives made using alkylation agents other than those exemplified (e.g., propylene oxide, glycidol, iodoacetamide, chloroacetate, 2-diethylaminoethylchloride) or similar non-selective alkylation processes.

The clever bit

The novelty lies in using an amorphous mixture of cyclodextrin derivatives. By ensuring the cyclodextrins themselves are non-crystalline and a mixture of many components, they prevent the drug-cyclodextrin complex from crystallizing. This stable, non-crystalline state is key to improving the drug's dissolution and absorption.

Why it matters

Many effective drugs don't dissolve well in water, making it hard for the body to absorb them. This patent offers a method to overcome this challenge, potentially making such drugs more effective or allowing for lower doses. This technology is fundamental to improving the "bioavailability" of medicines, ensuring that a larger portion of the drug reaches its target in the body. It has implications for a wide range of pharmaceutical products, from hormones to antiviral agents.

Real-world examples

• 1.Testosterone formulations
• 2.Estrogen and progesterone therapies
• 3.Antiviral drug formulations (e.g., acyclovir)
• 4.Anti-inflammatory drug formulations
• 5.Oral drug delivery systems for poorly soluble compounds
• 6.Buccal administration of hormones