拟备及管理皮下药物

Common subcutaneous medications include anticoagulants like heparin and enoxaparin, epinephrine for allergic reactions, insulin, and certain immunizations. These medications are selected for the subcutaneous route because they may be denatured or deactivated by gastric acid if given orally. Subcutaneous administration allows for slower, sustained absorption compared to intravenous routes.

Subcutaneous injection is chosen for medications that would be denatured or deactivated by the acidity of the gastrointestinal tract. This parenteral route bypasses the digestive system, preserving medication efficacy. It also provides slower, more sustained absorption, with some medications absorbing over 24 hours or longer, making it ideal for medications requiring prolonged therapeutic effects.

Subcutaneous needles are shorter and have a smaller diameter than intramuscular needles, typically measuring less than 5/8 inch in length and 26 gauge or smaller. Subcutaneous injections deliver small medication amounts, usually less than 2 mL. Medication preparations are commonly provided in vials or ampules for withdrawal into a subcutaneous syringe.

Subcutaneous medication absorption and onset are slower than intravenous routes, with absorption rates sometimes lasting 24 hours or longer. This slower absorption profile makes subcutaneous injection suitable for medications requiring sustained therapeutic levels. The subcutaneous route deposits medication into the tissue layer just below the skin, allowing gradual absorption into the bloodstream.

The nurse should determine the appropriate medication dose according to the concentration provided on the medication container. After obtaining the medication from the dispensing device, the nurse calculates the correct volume needed based on the stated concentration. Accurate dose determination ensures safe and effective medication administration while following safety checks and ten rights of medication administration.

After administering a subcutaneous medication, the nurse must document the administration in the electronic Medication Administration Record (MAR). This documentation includes verifying the ten rights of medication administration and recording the medication details, dose, time, and route. Accurate MAR documentation ensures medication safety, accountability, and continuity of patient care.

Subcutaneous injections deposit medication into the tissue layer just below the skin using shorter, smaller-gauge needles (less than 5/8 inch, 26 gauge or smaller), while preparing and administering intramuscular injections use longer needles that penetrate deeper muscle tissue. Subcutaneous injections deliver smaller volumes (less than 2 mL) and have slower absorption rates, making them suitable for different medication types and therapeutic goals.