Imipramine (Oral) – Patient Information (Australia)

Imipramine is a medicine from the tricyclic antidepressant (TCA) family. It has been used for many years to treat certain mental health conditions and, in some cases, other conditions such as bedwetting. This page explains how imipramine works, how it’s used, common interactions, safety considerations, and what to expect while taking it.

Important: Always follow the instructions provided with your specific product and consult a healthcare professional for advice tailored to you.

Basic product information

• Medicine name: Imipramine
• Medicine class: Tricyclic antidepressant (TCA)
• Common dosage forms: Tablets and/or capsule formulations (varies by brand and manufacturer)
• How it’s taken: Usually by mouth (oral use)
• Brand names: Different brands may exist in Australia; your product label will show the exact brand and strength.

How imipramine works (mechanism of action)

Imipramine affects chemicals in the brain that influence mood, sleep, and pain processing. While the exact antidepressant mechanism is complex, imipramine primarily:

• Inhibits reuptake of neurotransmitters such as serotonin and noradrenaline, increasing their availability in the brain.
• Has effects on other receptor systems, including histamine (H1) and muscarinic (cholinergic) receptors, which can contribute to side effects like drowsiness and dry mouth.

In many people, mood-related benefits develop gradually. For some conditions, dosing schedules and response patterns can differ from depression treatment.

Pharmacokinetics (how the body handles imipramine)

Pharmacokinetics describes absorption, distribution, metabolism, and elimination.

• Absorption: Imipramine is absorbed after oral dosing, with peak effects typically occurring within hours.
• Distribution: It distributes widely throughout the body, including the central nervous system.
• Metabolism: Imipramine is mainly processed in the liver through metabolism involving enzymes such as CYP pathways (commonly CYP2D6 and related enzymes).
• Active metabolites: It may form metabolites that also contribute to overall effect.
• Elimination: Metabolites are excreted mainly via urine and partly via bile/faeces.
• Half-life: Imipramine can have a prolonged duration in the body; steady effects often evolve over time.

Why this matters: Because imipramine persists in the body for a while, stopping suddenly can increase the risk of discomfort or symptom recurrence. Gradual changes are often advised under clinical guidance.

Typical uses of imipramine

Imipramine is used for:

• Depression (particularly in certain cases, depending on clinical assessment)
• Enuresis (bedwetting) in selected patients, often when other approaches are not sufficient
• Other conditions may be considered by clinicians depending on individual circumstances and product indications

Availability and exact indications may vary by product and local clinical practice.

When and how to take imipramine (timing and routine)

The best timing depends on your condition, prescribed dose, and whether side effects such as drowsiness occur.

• Start low and go slow: Many regimens begin with a lower dose and increase gradually to improve tolerability.
• Take consistently: Try to take imipramine at the same time each day.
• If it makes you drowsy: It’s often taken in the evening. Follow your prescriber’s instructions and the medication label.
• If it affects sleep: If you experience insomnia or vivid dreams, your dosing schedule may need adjustment.

How long until it helps? For depression, benefits may take several weeks. Some people notice sleep changes earlier, but mood improvement usually develops gradually. For bedwetting, effects may occur sooner, but monitoring is essential.

Food interactions (does food matter?)

In general, imipramine can be taken with or without food. Food usually does not drastically change overall effectiveness for many patients.

• If it causes nausea, taking it with food may reduce discomfort.
• Consistency helps: try to keep the same approach (with or without food) each day.

If you notice worsening side effects after a meal or certain foods, discuss with a pharmacist or doctor.

Alcohol and medicine interactions

Alcohol

It’s generally recommended to avoid or minimise alcohol while taking imipramine, as alcohol can:

• Increase drowsiness and dizziness
• Worsen thinking and coordination
• Increase risk of unsafe driving or falls
• Potentially worsen mood symptoms for some people

Other medicines (common interaction themes)

Imipramine can interact with other medicines that affect brain chemistry, liver metabolism, or heart rhythm.

• Other antidepressants and medicines affecting serotonin/noradrenaline: may increase risk of adverse effects.
• Medicines that prolong QT interval (some heart rhythm medicines and certain antibiotics/antipsychotics): may increase cardiac risk.
• Drugs that affect liver enzymes (especially CYP-related interactions): may raise or lower imipramine levels.
• Sedatives and sleeping tablets: may increase sedation.
• Anticholinergic medicines (e.g., some allergy, bladder, and gastrointestinal medicines): may add to dry mouth, constipation, blurred vision, and urinary retention.
• Stimulants or certain cold/flu medicines: may worsen jitteriness or increase blood pressure/heart rate in some people.

Always tell your healthcare professional about all medicines, including non-prescription products, vitamins, and herbal supplements.

Indications (who may be considered for imipramine?)

Imipramine is most often used in people where clinician assessment suggests benefits outweigh risks for:

• Major depression and other depressive presentations (individual suitability depends on medical history and side-effect risk)
• Bedwetting (enuresis) in selected patients where appropriate behavioural strategies and evaluation have been considered

Suitability may depend on factors such as:

• Your age and overall health
• Any heart rhythm or conduction problems
• Liver function
• Other medications you take
• History of side effects with similar medicines

Dosing overview (general guidance)

Note: Doses vary widely based on the indication, age, tolerability, and clinical judgement. The section below provides general information about dosing patterns rather than a personal dosing plan.

Adults

• Often started at a lower daily dose and increased gradually.
• For depression, total daily dose may be taken once daily (commonly evening) or divided (depending on tolerability and clinician instructions).

Older adults

• Lower starting doses are frequently used due to increased sensitivity to side effects (e.g., dizziness, constipation, confusion, falls).
• Monitoring may be more frequent, particularly for heart rhythm and blood pressure changes.

Children and adolescents

• Imipramine use in younger people is typically limited to specific indications such as enuresis where clinically appropriate.
• Weight-based or age-based dosing strategies may be used; careful monitoring is essential.

Bedwetting (enuresis) dosing patterns

• In many enuresis regimens, imipramine is taken at a time that supports overnight effect (often in the evening).
• Clinicians may review response and safety regularly, and consider treatment breaks depending on outcome and risk profile.

Do not change your dose without guidance. If you miss a dose, follow your product label or advice from your healthcare professional.

Safety profile and important precautions

Like all medicines, imipramine can cause side effects. Many are dose-related and improve as your body adjusts, but some effects require prompt attention.

Common side effects

• Drowsiness or fatigue
• Dizziness, especially when standing up
• Dry mouth
• Constipation
• Blurred vision
• Increased appetite or weight changes
• Sweating
• Tremor or restlessness in some people

Serious (seek urgent medical help) – warning signs

Contact emergency services or seek urgent medical attention if you experience:

• Symptoms of overdose (especially after taking more than prescribed): severe drowsiness, seizures, fainting, fast/irregular heartbeat, or breathing problems
• Chest pain, fainting, or severe palpitations
• Severe allergic reaction (swelling of face/lips, difficulty breathing, hives)
• Uncontrolled fever, muscle stiffness, confusion (rare but serious)
• New or worsening thoughts of self-harm, particularly early in treatment or after dose changes

Precautions and who should be extra cautious

• Heart disease, history of abnormal heart rhythm, or known QT prolongation
• Low blood pressure or history of fainting
• Glaucoma (narrow-angle glaucoma)
• Urinary retention or prostate enlargement
• Liver impairment
• Bipolar disorder or history of mania/hypomania
• Epilepsy/seizure disorders

Driving and machinery

Imipramine may impair alertness and coordination, especially when starting or adjusting dose. Avoid driving or operating machinery until you know how it affects you.

Practical use tips (getting the best benefit while staying safe)

• Keep track of side effects: Note timing (e.g., after taking in the evening) and severity. This helps clinicians adjust the regimen.
• Rise slowly: To reduce dizziness, stand up slowly from sitting or lying positions.
• Hydrate and manage dry mouth: Sip water regularly; sugar-free gum can help.
• Prevent constipation: Increase fluids and fibre; gentle activity can help. Ask a pharmacist if you need short-term constipation relief.
• Adherence matters: Try not to miss doses; consistent use supports steadier effects.
• Do not stop abruptly: Stopping suddenly may worsen symptoms or cause discontinuation effects. Discuss any changes with a healthcare professional.
• Plan for early follow-up: Early stages of treatment often require monitoring for response and side effects.

How to store and handle imipramine

• Store at room temperature away from excessive heat and moisture.
• Keep medicine in its original packaging and protect from light as directed on the label.
• Keep out of the sight and reach of children.
• If your household has children, consider safe storage measures due to the risks associated with accidental ingestion.

Alternative options

Depending on your condition, doctors may consider other medicines or strategies. Alternatives may include:

For depression

• Selective serotonin reuptake inhibitors (SSRIs) (e.g., sertraline, fluoxetine, citalopram)
• Serotonin–noradrenaline reuptake inhibitors (SNRIs) (e.g., venlafaxine, duloxetine)
• Other antidepressants with different side-effect profiles (based on suitability)
• Psychological therapies such as CBT (often alongside medication)

For bedwetting (enuresis)

• Behavioural strategies (e.g., timed toileting, fluid management)
• Enuresis alarms and bladder training approaches
• Other medicines used in selected cases (your clinician will consider benefits and safety)

Choice depends on medical history, current medicines, side-effect risks, and treatment response. A pharmacist can help compare general options and interactions.

Australia: market, legal and guidance context

In Australia, medicines are regulated by the Therapeutic Goods Administration (TGA). Medicines are classified based on safety and appropriate use. Many medicines in the antidepressant class are supplied under specific regulatory conditions and are intended to be used according to approved product information and clinical guidance.

For mental health treatments, Australian clinicians follow evidence-based guidance and monitor safety, including early-stage assessment for symptom changes and tolerability. For enuresis, approaches often combine behavioural measures with medicine when appropriate.

Recent guidance: While exact updates can vary over time, general trends in mental health care emphasise:

• Close monitoring during the early weeks of antidepressant therapy
• Attention to suicidality risk and mood changes, particularly in children/young people
• Reviewing medication interactions and cardiovascular risk when using TCAs
• Using the lowest effective dose and reassessing regularly

This page provides general information only and does not replace personalised medical advice.

Delivery and availability in Australia

Availability can differ by strength, brand, and current supply arrangements. If you’re ordering online, you may be asked to confirm that you meet product requirements according to Australian regulations.

• Dispatch: Orders are typically dispatched on business days once verified and processed.
• Delivery times: Delivery timelines depend on your location and chosen shipping method.
• Packaging: Medicines are usually packed to protect from light, heat, and tampering.
• Tracking: Many orders provide tracking details.

If you have any questions about availability or delivery, contact customer support before placing your order.

FAQ: Frequently asked questions

1. How quickly does imipramine work?

For depression, some people notice changes in sleep or energy sooner, but mood improvement often takes several weeks. For bedwetting, effects may occur earlier, but response varies and ongoing monitoring is important.

2. What should I do if I miss a dose?

Take the missed dose only if it is close to the time you would normally take it. If it’s near the next dose, skip the missed dose and continue your routine. Do not double up unless your healthcare professional advises otherwise. If unsure, ask a pharmacist.

3. Can I take imipramine with food?

Yes, it can generally be taken with or without food. If it upsets your stomach, taking it with food may help.

4. Is it safe to drink alcohol while taking imipramine?

It’s generally best to avoid or minimise alcohol because it can increase drowsiness, dizziness, and impaired coordination. If you’re unsure, speak with your pharmacist or doctor.

5. What are the most important drug interactions?

Interactions can occur with medicines that affect heart rhythm, sedation, liver metabolism, or anticholinergic effects. Always check your full medication list—including over-the-counter products and herbal supplements—before starting or stopping anything.

6. Why am I feeling drowsy or dizzy?

Drowsiness and dizziness are common, especially during the first days or when increasing dose. Taking it at the same time each day (often in the evening if advised) and rising slowly can help. If symptoms are severe, contact your healthcare professional.

7. Can I stop imipramine suddenly?

Stopping suddenly is often not recommended. Abrupt changes can lead to symptom recurrence or discontinuation effects. Discuss any plan to reduce or stop with a healthcare professional.

8. Does imipramine cause dry mouth and constipation?

Yes. These anticholinergic effects are common. Hydration, fibre, and over-the-counter measures may help, but if symptoms are significant, ask a pharmacist for guidance.

9. Is imipramine dangerous if too much is taken?

Overdose can be serious and should be avoided. Keep tablets/capsules out of reach of children and ensure safe storage. If an overdose is suspected, seek urgent medical help immediately.

10. Are there alternatives if I can’t tolerate imipramine?

Yes. Depending on the condition being treated, clinicians may consider other antidepressants, different treatment approaches, or non-medicine strategies. A pharmacist can also help review side effects and interactions.

Quick reference table

Need help choosing? If you have questions about how imipramine fits with your existing medicines or conditions, speak with a pharmacist or healthcare professional. This can improve safety and help you get the best possible outcomes.