Hydromorphone (Levo‑hydromorphone) – liquid 1 mg / ml
Hydromorphone is a potent opioid analgesic used for moderate‑to‑severe pain when other treatments (e.g., NSAIDs, weaker opioids) are inadequate. The “1 mg / ml” concentration is a common strength for oral solution (sometimes written “1 mg/mL” or “1 mg/mL (100 µg/mL)”). In the United States the drug is marketed under the brand name Dilaudid® (oral solution) and also as a liquid for intramuscular (IM) or intravenous (IV) use, usually at a lower concentration (≈ 0.5 mg/mL) to reduce the risk of respiratory depression.
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How the concentration is used
| Route | Typical concentration | Typical dosing (general guidance) |
|-------|------------------------|-----------------------------------|
| Oral (syringe) | 1 mg / ml (100 µg/mL) | 0.1–0.5 mg every 3–4 h as needed for pain (up to ~ 10 mg/day in opioid‑naïve adults; titrate slowly in opioid‑tolerant patients). |
| Intramuscular (IM) | 0.5 mg / mL (50 µg/mL) | 0.5–1 mg IM q3–4 h as needed (titrated by the clinician). |
| Intravenous (IV) | 0.5 mg / mL (50 µg/mL) | 0.2–0.5 mg IV q2–4 h (again titrated by the clinician). |
Note: The above numbers are illustrative. The exact dose, frequency, and route depend on the patient’s opioid tolerance, renal/hepatic function, age, and the clinical situation. Always follow a clinician’s prescription and the drug label.
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Key points about hydromorphone
| Topic | Highlights |
|-------|------------|
| Indications | Severe acute pain (e.g., post‑operative, injury), chronic pain in opioid‑tolerant patients, palliative care. |
| Mechanism | Potent μ‑opioid receptor agonist (≈ 10–20× the potency of morphine). |
| Pharmacokinetics | Rapid onset (oral ≈ 30 min, IV ≈ minutes). Half‑life ≈ 2–3 h. Metabolized mainly by CYP2D6 to inactive metabolites; minimal active metabolites. |
| Side effects | Common: nausea, vomiting, constipation, sedation, pruritus, dry mouth. Serious: respiratory depression, hypotension, hypoxia, delirium. |
| Contraindications | Acute or severe bronchial asthma, severe respiratory insufficiency, known hypersensitivity to hydromorphone or opioids. |
| Drug interactions | Alcohol, benzodiazepines, other CNS depressants → ↑ risk of respiratory depression. CYP2D6 inhibitors (e.g., fluoxetine) may reduce metabolism. |
| Addiction & dependence | High potential for tolerance, physical dependence, and abuse. Use only under medical supervision. |
| Withdrawal | Symptoms: agitation, anxiety, muscle aches, diarrhea, insomnia. Managed with gradual taper or opioid‑replacement therapy. |
| Storage | Keep in a secure, child‑proof location; keep refrigerated if recommended by the pharmacist. |
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Practical tips for patients (under medical supervision)
1. Take exactly as prescribed.
– Never double‑dose if you miss a dose; simply skip the missed dose (unless instructed otherwise by your prescriber).
– Use a syringe or oral dropper for accuracy.
2. Monitor for side effects.
– If you notice severe nausea, vomiting, or respiratory distress, seek immediate medical help.
3. Avoid alcohol and other sedatives while taking hydromorphone.
4. Manage constipation: stay hydrated, eat high‑fiber foods, and consider a stool softener or laxative as advised by your clinician.
5. Keep a pain diary (time of dose, pain level, side effects) to help your provider adjust therapy.
6. Never share your medication with others.
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When to call your clinician
- Unusual or severe dizziness, light‑headedness, or fainting.
- Rapid or difficult breathing.
- Persistent vomiting or inability to keep fluids down.
- Signs of allergic reaction (rash, swelling, itching, trouble breathing).
- Any other concerning symptom that isn’t typical for opioid use.
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Bottom line
Hydromorphone liquid at 1 mg/mL is a common oral strength that can effectively manage moderate‑to‑severe pain. Because it’s a potent opioid, it must be used under a clinician’s supervision, with careful titration, monitoring for adverse effects, and precautions against abuse or overdose. If you have questions about your specific dose, schedule, or how to handle side effects, your prescribing clinician or pharmacist are the best resources for personalized guidance.