How to use it
Contrave is taken in a stepped-up schedule over four weeks to reduce the risk of nausea and other early side effects.
- Week 1: one tablet each morning
- Week 2: one tablet morning and evening
- Week 3: two tablets in the morning, one in the evening
- Week 4 onward: two tablets morning and evening (the typical maintenance regimen)
The exact titration and maximum daily dose is decided individually, taking age, other medicines, and health conditions into account. Tablets are swallowed whole — crushing, chewing, or splitting them releases the bupropion component too quickly and raises seizure risk, since the extended-release coating is what keeps blood levels steady. Contrave should not be taken with a high-fat meal, which increases bupropion absorption beyond the tested range.
Take each dose with a similar low-fat meal or snack when possible, and swallow the tablet whole with water. Do not crush, chew, or split it.
Missed dose: Skip it and take the next scheduled dose at the usual time. Doubling up to "catch up" significantly raises seizure risk because it floods the system with bupropion faster than the extended-release design allows.
Comparison
Contrave sits in a different pharmacological category from the injectable incretin-based therapies that dominate current weight management discussion.
| Drug Name |
Active Ingredient |
Administration Route |
| Contrave |
Naltrexone HCl / Bupropion HCl |
Oral tablet |
| Wegovy |
Semaglutide |
Subcutaneous injection |
| Zepbound |
Tirzepatide |
Subcutaneous injection |
| Saxenda |
Liraglutide |
Subcutaneous injection |
The injectable options work on GLP-1 and, in the case of Zepbound, GIP receptors, slowing gastric emptying and reducing appetite through gut-hormone signalling. Contrave works centrally, through dopamine, norepinephrine, and opioid receptor pathways, with no injection required. Patients who are needle-averse, or who have a contraindication to GLP-1 therapy, are sometimes steered toward Contrave for that reason. The trade-off is that average weight loss in clinical trials of GLP-1 agonists tends to run higher than what's typically seen with Contrave, so the choice between them often comes down to mechanism tolerance and individual medical history rather than one being universally "stronger."
Possible side effects
Most people who tolerate Contrave past the first month report a side effect pattern that is predictable and front-loaded.
| Side Effect |
When It Typically Occurs |
| Nausea |
Most common; peaks during dose titration, often eases by week 4 |
| Headache |
Frequent in the first two weeks |
| Constipation |
Can persist throughout treatment; manageable with fibre and fluids |
| Dry mouth |
Common early on, usually mild |
| Insomnia |
More likely if the evening dose is taken too close to bedtime |
| Dizziness |
Usually transient, linked to dose increases |
| Tiredness |
Reported by a subset of patients, typically in the first weeks |
One detail patients often miss: taking the evening dose right before bed, rather than a few hours earlier, is a common cause of persistent insomnia. Shifting the timing earlier in the evening often resolves it without needing to stop the medication.
Bupropion HCl carries a boxed warning for suicidal thoughts and actions, especially in people under 25 and anyone with a history of depression or other psychiatric conditions. Clinicians monitor mood, behaviour, and any new agitation closely during the first months of treatment and after dose changes. Contrave can also lower the seizure threshold, which is why it is contraindicated in anyone with a current or past seizure disorder. Because naltrexone blocks opioid receptors, it carries a risk of precipitating sudden opioid withdrawal in patients who use opioid pain medicines regularly, and it increases the risk of opioid overdose if a patient stops opioids abruptly to start Contrave and later resumes them at a previous dose. The FDA-reviewed prescribing information also notes severe allergic reactions, including anaphylaxis and angioedema, as well as measurable increases in blood pressure and heart rate that require monitoring, especially in the first weeks of treatment [1].
What doctors say
Clinicians who prescribe Contrave regularly tend to set expectations around pace rather than magnitude. Weight loss that averages a few percent of body weight over several months, building on dietary change rather than replacing it, is the realistic frame most doctors use. In clinical practice, prescribers often describe the first month as a trial period — most of the nausea and headache burden shows up early, and whether a patient tolerates it predicts whether they'll stick with the full course. Doctors also tend to repeat the opioid-interaction warning more than any other, since patients rarely volunteer over-the-counter cold or pain medication use unless asked directly.
