What is Duromine?
Duromine is the brand name for phentermine, one of the oldest prescription weight loss medications still in use. Phentermine has been available since 1959 and works as a sympathomimetic amine — a stimulant that suppresses appetite through the central nervous system.
Unlike newer GLP-1 medications that mimic gut hormones, Duromine works similarly to amphetamines (though it's not an amphetamine itself). It triggers the release of norepinephrine in the brain, which suppresses hunger signals. The effect is fast-acting — most people notice reduced appetite within the first few days.
Duromine comes in three capsule strengths: 15mg, 30mg, and 40mg, taken once daily in the morning.
Why 12 weeks only?
Duromine is strictly short-term because of its stimulant properties:
- Tolerance develops: The appetite-suppressing effect diminishes over time as your body adapts
- Dependency risk: As a Schedule 8 controlled substance, prolonged use carries dependency risks
- Cardiovascular strain: Duromine increases heart rate and blood pressure, which is unsafe long-term
- No long-term efficacy data: There are no clinical trials supporting use beyond 12 weeks
After 12 weeks, your doctor will discuss next steps — which may include transitioning to a long-term medication like Wegovy or Mounjaro, or maintaining weight loss through lifestyle changes.
Who is Duromine best for?
- Short-term kickstart: People who need initial momentum before transitioning to long-term strategies
- Budget-conscious: At ~$100/month for up to 3 months, total cost is $200–300 — far less than GLP-1 medications
- Those who prefer tablets: No injections required
- People waiting for other medications: Can be used while waiting for Wegovy or Mounjaro availability
Who should NOT take Duromine?
- People with cardiovascular disease, uncontrolled hypertension, or arrhythmias
- People with hyperthyroidism or glaucoma
- Anyone with a history of drug or alcohol misuse
- Pregnant or breastfeeding women
- People taking MAO inhibitors, other stimulants, or certain antidepressants
- People over 65 (relative contraindication — higher cardiovascular risk)
Side effects
Duromine's side effects are stimulant-related and typically persist throughout treatment (unlike GLP-1 side effects which improve over time):
- Insomnia — the most common complaint. Take Duromine first thing in the morning, never afternoon or evening.
- Dry mouth — stay well hydrated throughout the day.
- Increased heart rate and blood pressure — should be monitored by your doctor.
- Restlessness and anxiety — reduce caffeine intake.
- Constipation — increase fibre and water.
- Mood changes — irritability can occur in some people.
Cost
Duromine is one of the most affordable weight loss medications:
- Monthly cost: approximately $80–120 depending on the dose (15mg, 30mg, or 40mg)
- Total treatment cost: $200–360 for a full 12-week course
- PBS: Not PBS-listed for weight management
Because Duromine prescriptions are limited to one month's supply at a time (due to its Schedule 8 status), you'll need a new consultation for each refill — factor in consultation costs.
How to get Duromine
Available through your GP or telehealth providers. Because it's a Schedule 8 controlled substance, some telehealth providers may be more cautious about prescribing it remotely.
Duromine vs GLP-1 medications
| Duromine | Wegovy / Mounjaro | |
|---|---|---|
| Weight loss | 5–10% | 15–21% |
| Duration | 12 weeks max | Long-term |
| Cost | ~$100/mo | $350–500/mo |
| Type | Daily tablet | Weekly injection |
| Mechanism | Stimulant (CNS) | Gut hormone (GLP-1) |
Duromine produces less weight loss and can only be used short-term, but it's significantly cheaper and doesn't require injections. Many patients start with Duromine as a kickstart and transition to a GLP-1 for long-term management.