Phloroglucinol

# Phloroglucinol ## Overview - **Classification**: Antispasmodic - **Mechanism**: Phloroglucinol is a non-atropinic antispasmodic. It acts directly on smooth muscle cells, reducing their tonicity and spasms in the gastrointestinal, biliary, and genitourinary tracts. ## Primary Indications 1. **Spasmodic Pain**: Relief of functional disorders of the GI tract (e.g., IBS), biliary system, or urinary tract (e.g., renal colic). 2. **Female Genital Tract Spasms**: Management of dysmenorrhea and as an adjuvant in labor to facilitate cervical dilation. ## Adult Dosing ### Standard Dosing **Spasmodic Pain (Oral)** - **Dose**: **80 mg** - **Frequency**: **Take 2 tablets (160 mg)** at onset of pain, then **1-2 tablets (80-160 mg)** as needed. - **Route**: Oral - **Maximum**: Up to **6 tablets (480 mg)** per day. **Acute Spasms (Parenteral)** - **Dose**: **40 mg** - **Frequency**: Administer slowly; may repeat with **40 mg** after 30-60 min if needed. - **Route**: IV or IM - **Maximum**: Up to **120 mg** per 24 hours. ### Dose Adjustments - **Renal Impairment**: No specific dose adjustments provided; use with caution. - **Hepatic Impairment**: No specific dose adjustments provided; use with caution. - **Elderly Patients**: No specific dose adjustments; use usual adult dose with caution. ## Pediatric Dosing ### Neonates (0-28 days) - **Not Recommended**: Safety and efficacy are not established. - **Special Notes**: Avoid use; consider alternative treatments. ### Infants (1-12 months) - **Not Recommended**: Safety and efficacy are not established. - **Special Notes**: Avoid use; consider alternative treatments. ### Children (1-12 years) **Spasmodic Pain** - **Age Group**: Children **> 6 years** - **Dose**: **80 mg** - **Frequency**: **Twice daily**, up to **3 times daily** if needed. - **Route**: Oral - **Maximum**: **240 mg/day**. ### Adolescents (13-18 years) **Spasmodic Pain** - **Dose**: Adult dosing: **80 mg** - **Frequency**: **2-3 times daily** as needed. - **Route**: Oral - **Maximum**: **480 mg/day**. ## Safety Information ### Contraindications - **Absolute**: Hypersensitivity to phloroglucinol. - **Absolute**: Mechanical obstruction of the gastrointestinal or urinary tract. - **Absolute**: Paralytic ileus. - **Absolute**: Megacolon. ### Common Adverse Effects - **Rare (<1%)**: Skin rash, pruritus, urticaria, dizziness. - **Serious but Rare**: Anaphylactic shock (especially with IV administration), angioedema, hypotension (with rapid IV injection). ### Key Drug Interactions - **Analgesics/Opioids**: May potentiate the antispasmodic effect. - **Other Antispasmodics**: May have synergistic effects; monitor for increased side effects. ## Monitoring & Follow-up - **Before Treatment**: Exclude mechanical obstruction, especially in acute abdominal pain. - **During Treatment**: Monitor for symptom relief and resolution of spasms. - **Clinical Signs**: Watch for signs of allergic reaction (rash, itching, swelling) or hypotension (with IV). ## Clinical Pearls - 💡 **Tip 1**: Phloroglucinol is a direct smooth muscle relaxant, avoiding anticholinergic effects. - 💡 **Tip 2**: It is often preferred when anticholinergics are contraindicated (e.g., in glaucoma, prostatic hypertrophy). - 💡 **Tip 3**: Parenteral forms provide rapid relief for acute, severe spasmodic pain. - 💡 **Tip 4**: Counsel patients that dizziness may occur; advise caution with driving or operating machinery. > **⚠️ Important**: This information is for educational purposes only. Always consult current prescribing information, local guidelines, and clinical judgment before prescribing.