PTISOFT LUBRICATING AND REWETTING EYE DROPS (Each ml contains Hydroxypropylmethyl Cellulose 0.3% w/v)

Indications

• Constipation
• Dietary fiber supplementation
• Irritable bowel syndrome
• Diverticular disease
• Weight management

Dosage

Children: Refer to appropriate guidelines for specific dosage; generally taken with adequate fluid intake.

Adults: Refer to appropriate guidelines for specific dosage; generally taken with adequate fluid intake.

Mechanism of action

Cellulose acts primarily as a bulk-forming laxative. It absorbs water in the intestines, which increases stool bulk and stimulates peristalsis, thus facilitating bowel movements. Additionally, cellulose is not digestible by human enzymes, leading to fermentation by gut bacteria, which may enhance gut health and alter gut microbiota composition.

Pharmacodynamics

Cellulose increases stool weight and frequency of bowel movements. It works by retaining water in the intestines, leading to softer stools and improved passage through the gastrointestinal tract. The bulking effect of cellulose can help alleviate constipation and promote overall digestive health. It may also play a role in cholesterol reduction and glycemic control through its effects on digestion and absorption of nutrients.

Pharmacokinetics

Cellulose is not absorbed into the bloodstream due to its indigestible nature. Instead, it passes through the gastrointestinal tract, where it adds bulk to the stool. Its fermentation by colonic bacteria produces short-chain fatty acids, which may have beneficial effects on colon health. The onset of action for cellulose as a laxative can vary but is generally within 24 to 72 hours after ingestion.

Adverse effects

• Bloating
• Flatulence
• Diarrhea
• Abdominal discomfort

Precautions

• Use with caution in patients with a history of gastrointestinal disorders.
• Monitor for potential allergic reactions in sensitive individuals.

Pregnancy

Cellulose is generally considered safe during pregnancy as it is a non-toxic, indigestible fiber.

Breast-feeding

Cellulose is also considered safe during breastfeeding; it is excreted in breast milk in negligible amounts.

Storage

Store in a cool, dry place away from direct sunlight.

Formulations

• Powder
• Capsules
• Tablets
• Granules

Indications

• Dry eye syndrome
• Ocular lubrication
• Controlled drug release
• Thickening agent in various formulations

Dosage

Children: Refer to specific product guidelines for detailed dosing information, as dosage may vary based on the formulation and intended use.

Adults: Refer to specific product guidelines for detailed dosing information, as dosage may vary based on the formulation and intended use.

Mechanism of action

Hydroxypropylmethylcellulose acts as a hydrophilic polymer that forms a gel-like consistency when mixed with water. This property is due to its hydroxyl and ether groups that interact with water molecules, enabling it to swell and create a viscous solution. In ocular applications, it provides lubrication and moisture retention, while in oral formulations, it can delay the release of active ingredients, enhancing bioavailability.

Pharmacodynamics

HPMC exhibits properties such as mucoadhesion and bioadhesion, which enhance its effectiveness in drug delivery systems. It interacts with biological membranes, leading to prolonged retention of the drug at the site of action. The viscosity of HPMC solutions can be adjusted by varying the concentration of the polymer, allowing for tailored therapeutic effects.

Pharmacokinetics

Hydroxypropylmethylcellulose is not absorbed systemically after administration. Its pharmacokinetic profile is characterized by its local action at the site of application. The rate of gel formation and viscosity can influence the release kinetics of co-administered drugs, but HPMC itself does not undergo significant metabolism or elimination in the body.

Adverse effects

• Allergic reactions
• Gastrointestinal disturbances
• Headache
• Dizziness

Precautions

• Use with caution in patients with known hypersensitivity to cellulose derivatives
• Consider potential effects on gastrointestinal absorption of other medications

Pregnancy

Safety during pregnancy has not been established. Use only if clearly needed and after assessing risks versus benefits.

Breast-feeding

It is not known if hydroxypropylmethylcellulose is excreted in human milk. Use with caution.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Hydroxypropylmethylcellulose 0.3% ophthalmic solution
• Hydroxypropylmethylcellulose topical gel