STERILE FORMULATIONS IN PHARMACEUTICS
Sterile formulations are dosage forms completely free from microorganisms. They are used in sensitive parts of the body such as blood, eyes, and internal tissues, so strict precautions are required during preparation.
Types of Sterile Formulations
- Injectables (Parenterals)
- Eye drops (Ophthalmic solutions)
- Eye ointments (Ophthalmic ointments)
Injectables
Injectables are sterile preparations administered directly into the body using a syringe or infusion. They provide rapid action and are used when oral administration is not suitable.
Importance of Sterility
- Bypass natural body defenses
- Enter directly into bloodstream or tissues
- Contamination can cause severe infections or death
Types of Injectables
- Injection (ready-to-use solution)
- Injection for reconstitution (dry powder)
- Suspension injections
- Emulsion injections
- Large Volume Parenterals (LVP)
- Small Volume Parenterals (SVP)
Routes of Administration
- Intravenous (IV)
- Intramuscular (IM)
- Subcutaneous (SC)
- Intradermal
Quality Requirements
- Sterile
- Pyrogen-free
- Free from particles
- Isotonic
- Stable and safe
Eye Drops (Ophthalmic Solutions)
Eye drops are sterile liquid preparations used in the eye. They must be highly pure to avoid irritation and infection.
Characteristics
- Sterile and particle-free
- Isotonic
- Suitable pH
- May contain preservatives
- Viscosity agents for better retention
Types
- Antibiotic drops
- Anti-allergic drops
- Lubricating drops
- Mydriatic/miotic drops
Packaging
- Plastic dropper bottles
- Single-dose sterile containers
Eye Ointments
Eye ointments are sterile semi-solid preparations that provide prolonged drug action in the eye.
Characteristics
- Sterile and smooth
- Melt at body temperature
- Provide prolonged contact
- May blur vision
Bases Used
- Petrolatum
- Mineral oil
- Lanolin
Importance of Sterility in Ophthalmics
- Prevents eye infections
- Avoids irritation and damage
- Protects vision
Packaging and Storage
- Airtight, sterile containers
- Protected from heat and light
- Eye products in droppers or tubes
- Injectables in vials, ampoules, syringes
Summary
Sterile formulations are critical dosage forms that require strict manufacturing and handling conditions to ensure safety, effectiveness, and prevention of infections.
