SINEO ORAL DROPS 1MG/ML 20ML

Indications

Approved Uses

Symptomatic relief of allergic conditions such as allergic rhinitis and urticaria, and pruritus (itching) of allergic/dermatologic origin (e.g., insect bites, eczema/dermatitis).

Off-Label Uses

No well-established off-label uses are routinely recommended; use is generally limited to labeled symptomatic treatment of allergy/pruritus.

Dosage & Administration

Dosing by Condition

Allergic conditions/pruritus: Adults and adolescents ≥12 years: 20-40 drops (1-2 mg) three times daily. Children: total daily dose 0.1 mg/kg/day divided into 3 doses (per prescriber).

Dose Adjustment Notes

No specific renal dose adjustment is typically required; use caution and consider lower doses in hepatic impairment and in older adults due to increased sensitivity to sedation/anticholinergic effects.

How to Take

Oral use: measure the prescribed dose with the dropper; may be given directly or mixed with a small amount of cool/lukewarm water, juice, or milk (including in an infant’s bottle if not hot).

Side Effects

Common Side Effects

Sedation, drowsiness, dizziness, dry mouth, fatigue, headache, nausea

Side Effect Frequency

Common: drowsiness/sedation and fatigue; other anticholinergic effects (e.g., dry mouth) occur; paradoxical excitation is uncommon/rare (especially in children)

Safety & Warnings

Contraindications

Hypersensitivity to dimethindene (or excipients); infants <1 month (including premature infants); narrow‑angle glaucoma; urinary retention/bladder neck obstruction (e.g., symptomatic prostatic hypertrophy).

Warnings & Precautions

May cause marked drowsiness-avoid driving/operating machinery; caution in epilepsy/seizure risk, asthma/COPD or other respiratory disease, hepatic/renal impairment, narrow‑angle glaucoma, prostatic hypertrophy/urinary retention, and with other CNS depressants; avoid in infants <1 month and use caution in infants/young children due to apnea/paradoxical excitation risk.

Age Restriction

Contraindicated in infants <1 month (including neonates); avoid in premature infants; use with caution in infants/children due to risk of sedation/apnea.

Drug Interactions

Drug Interactions

Additive CNS depression with alcohol, sedatives/tranquilizers, opioids and other CNS depressants; additive anticholinergic effects with anticholinergics and tricyclic antidepressants; avoid/contraindicated with MAO inhibitors due to potentiation of anticholinergic/CNS effects.

Interaction Severity

MAJOR: other CNS depressants (alcohol, benzodiazepines, opioids, sedative-hypnotics) due to additive sedation/respiratory depression risk. MODERATE: other anticholinergics (e.g., TCAs, antiparkinsonian anticholinergics) due to additive anticholinergic effects. MAOIs: use with caution (potentially enhanced anticholinergic/CNS effects), not typically described as causing hypertensive crisis with antihistamines.

Food Interaction

May be taken with or without food; mixing the drops with a small amount of liquid is acceptable.

Special Populations

Kidney Impairment

No established renal dose adjustment; use with caution in severe renal impairment (monitor for increased sedation/anticholinergic effects).

Storage & Patient Advice

Missed Dose

Take as soon as remembered; skip if it is almost time for the next dose. Do not double the dose

Stopping the Medicine

Can be stopped at any time; no tapering required.

Overdose

Symptoms: CNS depression (adults) or paradoxical CNS excitation (children), anticholinergic effects (dry mouth, mydriasis, tachycardia, urinary retention), fever/flushing, ataxia/hallucinations, seizures, and possible respiratory depression; Management: urgent medical care, supportive/symptomatic treatment, consider activated charcoal if early after ingestion and airway protected.

Patient Counseling

May cause drowsiness and impaired alertness-avoid driving/operating machinery until effects are known; avoid alcohol and other sedatives. Use exactly as prescribed and do not exceed the dose (especially in children). Measure with the dropper; may mix with a small amount of cool/lukewarm liquid. Store refrigerated at 2-8°C and do not freeze (per SFDA). Seek medical advice if urinary retention, severe dizziness, palpitations, or breathing difficulty occurs; use in infants only under medical direction.

Monitoring Requirements

No routine monitoring required; monitor for excessive sedation in children and elderly

Pharmacology

Mechanism of Action

Competitive H1-receptor antagonist that blocks histamine-mediated responses; also has anticholinergic activity and causes sedation due to CNS penetration.

Onset of Action

Typically within 30 minutes (about 30-60 minutes).

Duration of Effect

Approximately 6-8 hours.

Half-Life

Approximately 6 hours (range reported in references)

Bioavailability

Unknown (not reliably established in authoritative product information)

Metabolism

Hepatic metabolism (primarily oxidative metabolism and conjugation, including N-demethylation and glucuronidation)

Excretion

Renal and fecal (as metabolites), with urinary excretion predominating

Protein Binding

Approximately 90%

Product Information

Available Dosage Forms

For this SFDA-registered product: oral drops (1 mg/mL). Other dimethindene products in some markets may include topical gel, but extended-release capsules and nasal spray are not standard dimethindene dosage forms.

Composition per Dose

Each 1 ml: dimethindene maleate 1 mg

Generic Availability

Yes

OTC Alternatives

Non-sedating second-generation antihistamines such as cetirizine or loratadine (formulation depends on age: syrup/drops/tablets per local availability).

Symptom Target

Allergy, Runny Nose

Sedating

Yes

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