Drug administration refers to the process of delivering medication to a patient. This involves careful consideration of various factors, including the chosen route of administration, dosage, and frequency, to ensure safe and effective treatment. The selection of the appropriate dosage form is a crucial aspect of this process.

Description of Common Dosage Forms

This section details common dosage forms used in medication administration.

1. Tablets: Tablets are solid dosage forms composed of one or more active pharmaceutical ingredients (APIs) compressed with excipients (inactive ingredients like binders and fillers).
   
   • Types of Tablets:
     
     • Uncoated Tablets: Basic tablets without any coating.
     • Coated Tablets: Tablets covered with a layer to improve taste, stability, or drug release. These include:
       
       • Enteric-coated Tablets: Coated to resist dissolution in the stomach’s acidic environment; they dissolve in the higher pH of the small intestine. This prevents stomach irritation and ensures absorption where it’s most effective.
       • Sugar-coated Tablets: Coated with sugar to mask unpleasant tastes.
       • Film-coated Tablets: Covered with a thin polymer film for protection and improved appearance.
       • Extended-release (XR), Sustained-release (SR), or Long-acting (LA) Tablets: Designed to release the medication gradually over an extended period, providing a more consistent drug level in the body. These are often indicated by abbreviations such as XR, SR, or LA on the packaging (e.g., Nifedipine XR, Olfen SR, Adalat LA).
     • Scored Tablets: Contain a line across the tablet, allowing it to be easily broken into equal halves for dose adjustment.
     • Caplets: Coated tablets shaped like capsules for ease of swallowing (e.g., Panadol).
     • Effervescent Tablets: Contain acidic substances and carbonates that react with water to produce carbon dioxide, resulting in a fizzy solution intended for oral administration.
2. Capsules: Capsules are cylindrical solid dosage forms containing one or more active ingredients enclosed within a hard or soft gelatin shell.
   
   • Types of Capsules:
     
     • Slow-release Capsules: Contain pellets or granules that dissolve gradually in the gastrointestinal tract (GIT), providing sustained drug action (e.g., Olfen SR).
     • Soft Gelatin Capsules: Contain liquid or semi-liquid drug formulations within a soft gelatin shell (e.g., Vitamin A capsules).
     • Hard Gelatin Capsules: Two-piece capsules that fit together, usually containing powders or granules.
3. Creams: Creams are semi solid emulsions of oil and water, typically with water as the primary component. They are applied topically to the skin.
4. Lotions: Lotions are liquid or semisolid preparations containing one or more active ingredients in a liquid vehicle. They are applied topically to the skin without friction. (e.g., Calamine lotion)
5. Emulsions: Emulsions are mixtures of two immiscible liquids (like oil and water), where one liquid is dispersed as small droplets within the other.
6. Suppositories: Suppositories are solid dosage forms, usually made of glycerin or cocoa butter, designed for insertion into body orifices (rectum, vagina). They melt at body temperature, releasing the drug for either local or systemic effects.
7. Pessaries: Pessaries are solid preparations for vaginal insertion.
8. Ointments: Ointments are semisolid preparations with a greasy or oily base, intended for external application to the skin or mucous membranes. They provide a protective barrier and are occlusive, enhancing drug penetration (e.g., Betamethasone ointment for eczema).
9. Gels: Gels are transparent or translucent semisolid systems consisting of a liquid phase gelled by a suitable gelling agent. They are water-washable and used for topical application (e.g., Metronidazole gel for bacterial vaginosis).
10. Powders: Powders are finely divided solid dosage forms for oral, topical, or inhalation use. Oral powders may be reconstituted with water (e.g., ORS powder); topical powders absorb moisture (e.g., Zinc oxide powder for diaper rash).
11. Solutions: Solutions are homogeneous liquid preparations containing one or more dissolved active ingredients in a suitable solvent. They can be oral (syrups, elixirs), parenteral (IV infusions), or topical (e.g., Povidone-iodine solution).
12. Suspensions: Suspensions are liquid dosage forms in which insoluble solid particles are dispersed in a liquid vehicle. They require shaking before use to ensure uniform dosing (e.g., Amoxicillin suspension for pediatrics).
13. Injections: Injections are sterile preparations intended for parenteral administration (IV, IM, SC, ID). They include solutions, suspensions, or emulsions in ampoules or vials (e.g., Oxytocin injection).
14. Aerosols/Inhalers: Aerosols deliver medication as a fine mist or powder for inhalation. Metered-dose inhalers (MDI) or dry powder inhalers (DPI) are used for respiratory conditions (e.g., Salbutamol inhaler).
15. Patches (Transdermal): Patches are adhesive systems that release drug through the skin at a controlled rate for systemic effect (e.g., Fentanyl patch for chronic pain; though rare in midwifery).
16. Implants: Implants are small, sterile devices inserted subcutaneously for prolonged drug release (e.g., Levonorgestrel implant for contraception).

Routes of Drug Administration

The route determines onset, duration, and site of action. Common routes include:

1. Oral (PO): Most convenient; swallowed tablets, capsules, liquids. Subject to first-pass metabolism; contraindicated in vomiting or unconscious patients.
2. Sublingual/Buccal: Placed under tongue or against cheek; rapid absorption bypassing liver (e.g., Glyceryl trinitrate for angina).
3. Parenteral:
   
   • Intravenous (IV): Direct into vein; immediate effect, 100% bioavailability (e.g., IV fluids, antibiotics).
   • Intramuscular (IM): Into muscle; faster than SC (e.g., Pethidine in labor).
   • Subcutaneous (SC): Into fatty tissue; slow, sustained (e.g., Heparin).
   • Intradermal (ID): Into dermis; for allergy testing.
4. Topical: Applied to skin or mucous membranes for local effect (creams, ointments); minimal systemic absorption unless occlusive.
5. Transdermal: Systemic via skin patch.
6. Rectal: Suppositories or enemas; useful in nausea, infants (e.g., Diazepam for seizures).
7. Vaginal: Pessaries, creams; local (e.g., Clotrimazole for candidiasis) or systemic (Misoprostol).
8. Inhalation: Gases, aerosols; rapid lung absorption (e.g., Oxygen, Ventolin).
9. Otic: Ear drops for local effect.
10. Ophthalmic: Eye drops/ointments.

The Five Rights of Drug Administration

To prevent errors:

• Right Patient: Verify with two identifiers (name, file number).
• Right Drug: Check label three times (when taking, before opening, before giving).
• Right Dose: Calculate accurately, especially weight-based in pediatrics/midwifery.
• Right Route: Confirm prescription matches intended path.
• Right Time: Adhere to schedule; consider food/drug interactions.

Extended rights: Right Documentation, Right Reason, Right Response, Right to Refuse, Right Education.

General Principles and Nursing Responsibilities

• Assessment: Review history (allergies, pregnancy, renal/hepatic function), vital signs, lab results.
• Planning: Select appropriate form/route; prepare equipment (syringes, IV sets).
• Implementation:
  
  • Use aseptic technique for parenterals.
  • Crush tablets only if allowed (never ER tablets).
  • Dilute IV drugs as per protocol.
  • Stay with patient for first dose of high-risk drugs.
• Evaluation: Monitor therapeutic effects, side effects, ADRs.
• Documentation: Record drug, dose, route, time, site (for injections), patient response, signature.
• Patient Education: Explain purpose, administration, side effects, storage, adherence.
• Storage: Follow cold chain (2–8°C for vaccines), protect from light/heat, lock narcotics.
• Error Prevention: Barcode scanning, double-checking high-alert drugs (oxytocin, magnesium sulfate, insulin).
• Legal/Ethical: Administer only prescribed drugs; obtain consent; report errors via incident forms.

Special Considerations in Midwifery

• Pregnancy: Use FDA Category A/B drugs; avoid teratogens. Adjust doses for increased plasma volume.
• Labor: IV access mandatory; titrate oxytocin carefully with CTG monitoring.
• Postpartum: Promote lactation-safe drugs; counsel on contraception.
• Neonates: Use weight-based dosing; avoid IM in preterms; monitor for apnea with opioids.

These principles ensure rational, safe, and effective drug use in clinical practice.