COLD CAPSULE IV
Clinical safety rating: caution
Comprehensive clinical and safety monograph for COLD CAPSULE IV (COLD CAPSULE IV).
Combination of antihistamine (chlorpheniramine) blocking H1 receptors, nasal decongestant (phenylephrine) causing vasoconstriction, and analgesic/antipyretic (acetaminophen) inhibiting COX enzymes in CNS.
| Metabolism | Acetaminophen primarily via glucuronidation and sulfation; minor CYP2E1 and CYP3A4 oxidation. Chlorpheniramine via CYP2D6. Phenylephrine via MAO-A and sulfation. |
| Excretion | Renal elimination of acetaminophen metabolites (primarily glucuronide and sulfate conjugates) accounts for ~85-90% of the dose; unchanged drug <5%. Pseudoephedrine and dextromethorphan are primarily excreted renally (70-90% and 50-80% respectively, with some biliary/fecal). |
| Half-life | Acetaminophen: 2-3 hours (prolonged in hepatic impairment). Pseudoephedrine: 5-8 hours (alkaline urine increases half-life). Dextromethorphan: 3-5 hours (CYP2D6 poor metabolizers: up to 20 hours). |
| Protein binding | Acetaminophen: 10-25% (albumin). Pseudoephedrine: ~20-30% (albumin). Dextromethorphan: ~60-70% (albumin and alpha-1-acid glycoprotein). |
| Volume of Distribution | Acetaminophen: 0.9-1.0 L/kg (widely distributed, minimal CNS). Pseudoephedrine: 2.6-3.5 L/kg (extensive tissue distribution). Dextromethorphan: 5-6 L/kg (large Vd due to lipophilicity). |
| Bioavailability | Acetaminophen: 75-85% oral (rapid absorption, first-pass metabolism). Pseudoephedrine: ~90% oral (minimal first-pass). Dextromethorphan: 40-50% oral (extensive first-pass CYP2D6 metabolism). |
| Onset of Action | Acetaminophen: 30-60 min oral. Pseudoephedrine: 30-60 min oral. Dextromethorphan: 15-30 min oral. |
| Duration of Action | Acetaminophen: 4-6 hours. Pseudoephedrine: 4-6 hours (extended-release forms up to 12-24 hours). Dextromethorphan: 4-6 hours. |
1-2 capsules orally every 4-6 hours as needed for symptoms; maximum 12 capsules per day.
| Dosage form | CAPSULE, EXTENDED RELEASE |
| Renal impairment | GFR 30-50 mL/min: reduce dose interval to every 8 hours; GFR <30 mL/min: avoid use or use with caution. |
| Liver impairment | Child-Pugh A: no adjustment; Child-Pugh B: reduce dose by 50%; Child-Pugh C: contraindicated. |
| Pediatric use | Not recommended for children under 12 years due to lack of safety data. |
| Geriatric use | Start at lower end of dosing range (1 capsule every 6-8 hours); monitor for anticholinergic effects and CNS depression. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for COLD CAPSULE IV (COLD CAPSULE IV).
| Breastfeeding | Safety varies by ingredient. Acetaminophen: M/P ratio 0.91-1.42, compatible. Pseudoephedrine: M/P ratio 2.6-3.5, excreted into milk; may reduce milk production. Antihistamines: chlorpheniramine has M/P 0.25-0.5, low risk; diphenhydramine may cause infant drowsiness. Dextromethorphan: M/P unknown, likely safe. Avoid combination products; choose single-ingredient acetaminophen if needed. |
| Teratogenic Risk | Cold Capsule IV typically contains multiple active ingredients such as antihistamines, decongestants, antipyretics, and antitussives. First trimester: Avoid antihistamines (e.g., chlorpheniramine) and decongestants (e.g., pseudoephedrine) due to possible teratogenic risk; acetaminophen is considered safer. Second/third trimesters: Decongestants may cause uterine vasoconstriction; antihistamines near term may cause neonatal respiratory depression. Overall, risk is low with single-ingredient acetaminophen; combination products are not recommended. |
■ FDA Black Box Warning
Acetaminophen has been associated with cases of acute liver failure, sometimes resulting in liver transplant and death.
| Serious Effects |
["Hypersensitivity to any component","Concurrent MAO inhibitor therapy","Severe hypertension or coronary artery disease","Glaucoma","Urinary retention"]
| Precautions | ["Severe liver damage with acetaminophen if exceeding 4 g/day or with alcohol use","Do not use with other acetaminophen-containing products","Caution in hypertension, heart disease, diabetes, thyroid disease, and prostatic hypertrophy due to phenylephrine","Avoid in children <4 years"] |
| Food/Dietary | Avoid alcohol; may increase risk of liver toxicity with acetaminophen and enhance sedative effects of antihistamines. Grapefruit juice may affect metabolism of some ingredients; avoid if product contains dextromethorphan. Caffeine-containing foods/beverages may add to stimulant effects of decongestants. |
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| Fetal Monitoring | Maternal: Blood pressure, heart rate (especially with decongestants), signs of hypertension or tachycardia. Fetal: Heart rate monitoring if decongestants used; ultrasound for growth if chronic use of vasoconstrictors. No specific monitoring required for short-term use of acetaminophen. |
| Fertility Effects | No known significant effects on fertility with short-term use. Chronic high-dose acetaminophen may reduce ovarian reserve in animal studies; clinical relevance unclear. Decongestants may affect sperm motility transiently. Overall, minimal impact on fertility. |
| Clinical Pearls | Combination cold products often contain acetaminophen; beware of inadvertent overdose if also taking standalone acetaminophen. Antihistamines (e.g., chlorpheniramine) can cause sedation, especially in elderly. Decongestants (e.g., phenylephrine) may elevate blood pressure and heart rate; use cautiously in hypertension, CAD, or hyperthyroidism. Cough suppressants (dextromethorphan) risk serotonin syndrome with MAOIs or SSRIs. Check product label for all active ingredients. |
| Patient Advice | Do not take more than 4 doses in 24 hours. · Avoid alcohol while taking this medication. · Do not take with other products containing acetaminophen to avoid liver damage. · May cause drowsiness; avoid driving or operating machinery. · If you have high blood pressure, heart disease, or thyroid problems, consult your doctor before use. |