Parenterale Medikamentengabe: Wege, Indikationen und Vor- & Nachteile

Parenteral administration delivers medication by any route other than the gastrointestinal tract—bypassing oral or enteral absorption entirely.

Common Routes

• Intravenous (IV): Bolus or infusion; provides immediate effect and 100% bioavailability.
• Intramuscular (IM): Deltoid, vastus lateralis, or ventrogluteal sites; depot effect with faster absorption than subcutaneous.
• Subcutaneous (SC/SQ): Abdomen, thigh, or upper arm; slow, sustained absorption—ideal for insulin, heparin, and biologics.
• Intradermal (ID): Into the dermis; used for TB testing, BCG vaccine, and allergy testing.
• Other routes: Intra-arterial, intrathecal, intra-articular, intraperitoneal, and intraosseous (emergency access).

When Parenteral Therapy Is Indicated

• Drug is destroyed by GI enzymes or acid (e.g., proteins, peptides).
• Poor or unpredictable oral bioavailability.
• Rapid onset required (emergencies).
• Patient is NPO, vomiting, or has malabsorption.
• Precise titration needed (vasopressors, chemotherapy).
• Local effect desired (joint, spinal).

Advantages vs. Disadvantages