Intravenous fluids
| Drug monograph · NCLEX study reference | |
| Therapeutic class | IV fluid and electrolyte replacement |
|---|---|
| Pharmacologic class | Crystalloid solutions by tonicity |
| Onset / peak / duration | Immediate during infusion. |
| Half-life / level | Not applicable; guided by clinical status and labs. |
| Routes | IV |
| High-alert (ISMP) | No |
| Black box warning | None |
| Antidote / reversal | Adjust the fluid plan; diuretics for overload. |
| Pregnancy / lactation | Used as needed. |
Nursing pharmacology study reference (NCLEX-style monograph). Numeric values are standard teaching ranges for study and must be verified against current manufacturer labeling before clinical use. This is educational content, not prescribing guidance.
Intravenous fluids — IV fluid and electrolyte replacement; Crystalloid solutions by tonicity.
Identification
- Therapeutic class: IV fluid and electrolyte replacement.
- Pharmacologic class: Crystalloid solutions by tonicity.
Pharmacology
- Mechanism of action: Isotonic fluids stay in the vascular space to expand volume; hypotonic fluids shift water into cells; hypertonic fluids pull water out of cells into the vascular space.
- Onset / peak / duration: Immediate during infusion.
- Half-life / therapeutic level: Not applicable; guided by clinical status and labs.
Clinical use
- Indications: Isotonic for volume resuscitation and maintenance (normal saline, lactated Ringer's); hypotonic for cellular dehydration (0.45% saline); hypertonic for severe hyponatremia or cerebral edema (3% saline) and caloric needs.
- Usual dose, route, frequency: IV at a rate set by the clinical need.
- Maximum dose / adjustments: Adjust for cardiac, renal, and hepatic status; hypertonic saline through monitored access and slow correction.
Safety
- Contraindications: Lactated Ringer's caution in liver failure and hyperkalemia; hypertonic saline requires careful sodium correction.
- Black box warning: None.
- Interactions: Lactated Ringer's contains potassium and calcium (incompatible with some drugs, including ceftriaxone in neonates and blood products).
- Pregnancy / lactation: Used as needed.
- High-alert: No.
Adverse effects
- Common side effects: Local infusion effects.
- Serious effects to report: Fluid overload (crackles, edema, dyspnea), rapid sodium shifts (osmotic demyelination with too-fast correction), cellular swelling (overuse of hypotonic), phlebitis.
- Antidote / reversal: Adjust the fluid plan; diuretics for overload.
Nursing process
- Assessment before administration: Volume status, electrolytes, lung and heart sounds, weight, the correct fluid order.
- Interventions during therapy: Verify the right fluid and rate; monitor for overload; correct sodium slowly; hypertonic saline through a monitored line.
- Monitor: Intake and output, weight, lung sounds, electrolytes (especially sodium), vital signs.
- Evaluation / expected outcome: Restored fluid and electrolyte balance.
Patient teaching
- Patient teaching: Report shortness of breath or swelling.
- Notify provider if: Difficulty breathing, swelling, IV-site pain.
- Administration tips: Verify tonicity and rate; D5W becomes hypotonic in the body; hypertonic saline corrected slowly.