Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
HEMICLOR vs MICRO-K LS
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Hemichlor (HEMICLOR) is a brand name for a combination product containing chlorpheniramine and pseudoephedrine. Chlorpheniramine is a first-generation antihistamine that antagonizes histamine at H1 receptor sites, reducing allergic symptoms. Pseudoephedrine is a sympathomimetic amine that directly stimulates alpha-adrenergic receptors, causing vasoconstriction and decongestion.
Potassium supplement; replaces intracellular potassium, essential for nerve conduction, muscle contraction, and acid-base balance.
Relief of symptoms associated with seasonal and perennial allergic rhinitis, including nasal congestion, sneezing, rhinorrhea, and pruritus,Off-label: Adjunctive treatment for acute sinusitis and common cold symptoms
Hypokalemia prevention or treatment,Diuretic-induced hypokalemia,Digitalis intoxication
50-100 mg intravenously every 6 hours or 100 mg orally every 12 hours.
10-20 m Eq (as potassium chloride) orally twice daily; maximum 100 m Eq/day.
Terminal elimination half-life 18–24 hours in normal renal function; prolonged to 36–48 hours in moderate renal impairment (Cr Cl 30–50 m L/min); adjust dosing interval in renal disease.
Not applicable (K+ is an electrolyte, not eliminated by first-order kinetics). Clinical context: Serum K+ decline follows redistribution and excretion with a half-life of ~2-4 hours after IV bolus.
Chlorpheniramine is extensively metabolized in the liver via CYP450 enzymes, primarily CYP2D6, and excreted renally as metabolites. Pseudoephedrine is partially metabolized in the liver by N-demethylation and excreted largely unchanged in urine; its metabolism is not significantly enzyme-dependent.
Not metabolized; excreted primarily via kidneys.
Primarily renal (85–90% as unchanged drug via glomerular filtration and tubular secretion); biliary/fecal < 5%.
Renal: ~90% as KCl (proportional to intake). Biliary/fecal: <10%.
70–80% (primarily to albumin).
None (K+ is free ion).
0.3–0.5 L/kg (indicates moderate tissue distribution).
0.35 L/kg (approximate total body water; distributes primarily in extracellular fluid).
Oral: 40–60% (due to first-pass metabolism; food may reduce absorption).
Oral: ~80-100% for microencapsulated KCl (MICRO-K), but can be incomplete due to slower release.
GFR 30-50 m L/min: 50 mg IV every 12h or 50 mg PO every 24h; GFR 10-29 m L/min: 50 mg IV every 24h or 25 mg PO every 24h; GFR <10 m L/min: 25 mg IV every 48h or avoid use.
GFR 50-90 m L/min: no adjustment. GFR 30-49 m L/min: reduce dose by 25-50%. GFR <30 m L/min: avoid use or reduce dose by 50-75% with close monitoring.
Child-Pugh A: no adjustment; Child-Pugh B: reduce dose by 50%; Child-Pugh C: avoid use.
Child-Pugh A: no adjustment. Child-Pugh B: reduce dose by 25-50%. Child-Pugh C: avoid use or reduce dose by 50%.
5-10 mg/kg IV every 6h, max 100 mg/dose.
1-3 m Eq/kg/day orally in 2-4 divided doses; maximum 1 m Eq/kg per dose and 100 m Eq/day.
Start at lower end of dosing range (50 mg IV every 12h or 50 mg PO every 24h) due to reduced renal function and increased sensitivity.
Initiate at lower end of dosing range (10-20 m Eq/day); monitor renal function and serum potassium frequently; adjust based on renal function.
No FDA black box warning is present for HEMICLOR.
No black box warning.
Cardiovascular effects: Use with caution in patients with hypertension, ischemic heart disease, or arrhythmias,CNS depression: Chlorpheniramine may cause sedation; avoid concurrent use with alcohol or other CNS depressants,Monoamine oxidase inhibitor (MAOI) interaction: Concomitant use with MAOIs or within 14 days of discontinuation can precipitate hypertensive crisis,Urinary retention: Use cautiously in patients with prostatic hypertrophy or bladder neck obstruction,Photosensitivity: Chlorpheniramine may increase risk of photosensitivity reactions
Risk of hyperkalemia especially in renal impairment,Use with caution in cardiac disease,GI irritation or ulceration with oral forms,Slow release formulations may cause GI lesions
Hypersensitivity to chlorpheniramine, pseudoephedrine, or any component,Concurrent use of monoamine oxidase inhibitors (MAOIs) or within 14 days of MAOI therapy,Severe hypertension or severe coronary artery disease,Narrow-angle glaucoma,Urinary retention,Breastfeeding (relative contraindication due to pseudoephedrine excretion)
Hyperkalemia,Severe renal impairment,Untreated Addison's disease,Acute dehydration,Use of potassium-sparing diuretics
Avoid alcohol and grapefruit juice. Take with food to reduce gastrointestinal upset. Limit caffeine intake as it may worsen anxiety or gastrointestinal symptoms.
Avoid excessive intake of potassium-rich foods (e.g., bananas, oranges, potatoes, spinach, avocados, dried fruits, salt substitutes containing potassium chloride). Do not take with alcohol as it may increase GI irritation. Grapefruit juice has no significant interaction, but large amounts of any food high in potassium should be avoided.
Hemichlor (hydrochlorothiazide) is contraindicated in pregnancy due to risk of fetal/neonatal jaundice, thrombocytopenia, and electrolyte disturbances. First trimester: associated with neural tube defects in animal studies and possible oligohydramnios. Second/third trimester: risk of fetal bradycardia, hyponatremia, hypokalemia, and decreased placental perfusion.
MICRO-K LS (potassium chloride) is not associated with teratogenicity. No fetal risks have been reported in any trimester. Use during pregnancy is considered safe when indicated.
Hydrochlorothiazide is excreted in breast milk in low concentrations. M/P ratio approximately 0.04-0.06. No adverse effects reported in infants, but may suppress lactation at high doses. Use with caution, monitor infant for electrolyte disturbances.
Potassium is a normal component of breast milk. No adverse effects expected at maternal therapeutic doses. M/P ratio: not applicable (endogenous electrolyte).
Pregnancy increases volume of distribution and renal clearance of hydrochlorothiazide, potentially reducing peak serum concentration. However, due to fetal risks, thiazide diuretics are generally avoided in pregnancy. If essential, use lowest effective dose and monitor maternal/fetal status closely. No specific dose adjustment studies exist.
No dose adjustment typically required. Maintain serum potassium within normal range. Monitor for hypokalemia or hyperkalemia as clinically indicated.
HEMICLOR contains clidinium bromide (quaternary ammonium anticholinergic) and chlordiazepoxide (benzodiazepine). Monitor for anticholinergic side effects (dry mouth, blurred vision, urinary retention, constipation). Avoid use in patients with narrow-angle glaucoma, obstructive uropathy, or myasthenia gravis. Chlordiazepoxide may cause dependence; limit duration to 4-8 weeks. Use with caution in elderly due to increased sensitivity to anticholinergic effects and risk of falls.
MICRO-K LS contains potassium chloride microencapsulated granules for sustained release. Avoid in patients with severe renal impairment (Cr Cl <30 m L/min), untreated Addison's disease, or hyperkalemia. Use with caution in patients with cardiac disease or concurrent use of ACE inhibitors, ARBs, or potassium-sparing diuretics. Do not crush or chew capsules; administer with a full glass of water to prevent GI mucosal damage. Monitor serum potassium regularly, especially in elderly and diabetic patients.
Take exactly as prescribed; do not increase dose or stop abruptly.,May cause drowsiness or dizziness; avoid driving or operating machinery until you know how it affects you.,Avoid alcohol and other CNS depressants.,Report any signs of urinary retention, severe constipation, or blurred vision.,Do not share with others; risk of dependence.,Store at room temperature away from moisture and heat.
Take this medication exactly as prescribed, preferably with meals or a full glass of water.,Do not crush, chew, or break the capsules; swallow them whole.,Avoid foods high in potassium (e.g., bananas, oranges, tomatoes, salt substitutes) unless directed by your doctor.,Contact your doctor immediately if you experience muscle weakness, irregular heartbeat, numbness/tingling, or dark/tarry stools.,Store at room temperature away from moisture and heat.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about HEMICLOR vs MICRO-K LS, answered by our medical review team.
HEMICLOR is a Electrolyte Supplement that works by Hemichlor (HEMICLOR) is a brand name for a combination product containing chlorpheniramine and pseudoephedrine. Chlorpheniramine is a first-generation antihistamine that antagonizes histamine at H1 receptor sites, reducing allergic symptoms. Pseudoephedrine is a sympathomimetic amine that directly stimulates alpha-adrenergic receptors, causing vasoconstriction and decongestion.. MICRO-K LS is a Electrolyte Supplement (Potassium) that works by Potassium supplement; replaces intracellular potassium, essential for nerve conduction, muscle contraction, and acid-base balance.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between HEMICLOR and MICRO-K LS depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of HEMICLOR is: 50-100 mg intravenously every 6 hours or 100 mg orally every 12 hours.. The standard adult dose of MICRO-K LS is: 10-20 m Eq (as potassium chloride) orally twice daily; maximum 100 m Eq/day.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between HEMICLOR and MICRO-K LS in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. HEMICLOR is classified as Category C. Hemichlor (hydrochlorothiazide) is contraindicated in pregnancy due to risk of fetal/neonatal jaundice, thrombocytopenia, and electrolyte disturbances. First trimester: associated . MICRO-K LS is classified as Category C. MICRO-K LS (potassium chloride) is not associated with teratogenicity. No fetal risks have been reported in any trimester. Use during pregnancy is considered safe when indicated.. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.