Contrave Dosing Schedule: Week-by-Week Titration | Harbor

If your doctor has just handed you a Contrave prescription, you're probably staring at the pharmacy label, wondering why you aren't starting at the full dose right away. Unlike a simple once-daily pill you can take at full strength from day one, Contrave uses a carefully designed four-week titration schedule that gradually ramps your body up to the target dose. There's a good clinical reason for this, and understanding each phase can make the difference between pushing through the adjustment period and giving up before the medication has a real chance to work.

Why Contrave Requires a Gradual Dose Escalation

Each tablet combines two active ingredients, 8 mg of naltrexone hydrochloride and 90 mg of bupropion hydrochloride, in an extended-release formulation. These two compounds work on different parts of the brain, and the gradual ramp-up serves several purposes. Bupropion stimulates pro-opiomelanocortin (POMC) neurons in the hypothalamus, which release alpha-MSH, a signaling molecule that suppresses appetite and increases energy expenditure. However, POMC neurons also release beta-endorphin, which loops back and shuts down their own activity. That's where naltrexone comes in. By blocking the mu-opioid receptor, naltrexone prevents beta-endorphin from hitting the brakes, allowing POMC neurons to keep firing. Preclinical studies showed that combining the two compounds in the brain's reward system produces a synergistic reduction in food intake compared with either drug alone.

Contrave dosing routine shown as a smiling woman in a purple sports bra holds a pill and a glass of water with a tape measure draped around her neck.

The titration exists because bupropion is dose-dependent for seizure risk. The risk of seizure can be minimized by gradually escalating the dose, dividing the daily dose into two administrations, and never exceeding two tablets at a time. Starting at a lower dose also allows your gastrointestinal system to adjust, which substantially reduces nausea, the most commonly reported side effect in clinical trials. Various factors that may influence the appropriate dose and dosing schedule for Contrave include patient characteristics and concurrent medications.

Week 1: One Tablet, One Goal — Let Your Body Adjust

The Dose

During week one, you take one tablet each morning. That's a total daily intake of 8 mg naltrexone and 90 mg bupropion, exactly one quarter of the eventual maintenance dose.

What to Expect

The first week is the gentlest phase. Many patients report minimal side effects at this dose, though some do experience mild nausea, a slight headache, or minor changes in appetite. You may not notice any appetite suppression at all yet, and that's completely normal. The medication is building up in your system, and the therapeutic effects take time to emerge.

Because Contrave is an extended-release formulation, the tablets must be swallowed whole. Do not cut, crush, or chew them. Doing so can dump the full dose into your bloodstream at once, bypassing the controlled-release mechanism and increasing the risk of side effects, including seizure.

Practical Tips for Week 1

Take the tablet with a low- to moderate-fat meal or a small snack. High-fat meals significantly increase systemic exposure to both bupropion and naltrexone, meaning your body absorbs more of the drugs faster than intended. A bowl of oatmeal, toast with a modest amount of peanut butter, or a piece of fruit with yogurt are reasonable options. Establish a consistent morning time for your dose. Setting a daily alarm helps build the habit before the schedule becomes more complex in the weeks ahead. Some patients find it helpful to use a pill organizer to track whether they've taken their dose, especially as the schedule adds an evening tablet in week two.

Week 2: Adding the Evening Dose

The Dose

Starting in week two, you add one tablet in the evening, bringing the total to two tablets per day. One in the morning, one in the evening. Your daily intake doubles to 16 mg naltrexone and 180 mg bupropion.

What to Expect

This is when more patients begin to notice side effects, particularly nausea. According to the official Contrave patient information, side effects are more noticeable during the first four weeks because the dose is still climbing. The nausea tends to be most pronounced in the first few days after each dose increase and often improves within a week as your body acclimates. Some patients also report constipation, dry mouth, dizziness, or difficulty sleeping. If insomnia becomes an issue, talk to your prescriber about shifting the evening dose slightly earlier, while still maintaining a clear split between your morning and evening doses.

Managing Nausea During This Phase

Nausea is the single most common reason patients consider stopping Contrave early, so it's worth having a strategy ready. Smaller, more frequent meals tend to help more than three large ones. Bland foods are easier on the stomach when you're feeling queasy. Ginger tea, ginger chews, and staying well hydrated with small, frequent sips of water are supported by general antiemetic practice.

If nausea is severe or persistent, don't simply endure it. Contact your prescriber, who may recommend a short course of an over-the-counter antiemetic or, in some cases, a brief pause before retrying the dose increase. The goal of the titration is to reach the full dose, but not at the cost of abandoning treatment entirely.

Week 3: Approaching the Target

The Dose

In week three, the morning dose increases to two tablets, while the evening dose stays at one tablet, for a total of three tablets per day (24 mg naltrexone and 270 mg bupropion).

What to Expect

By now, many patients have passed the worst of the adjustment period. Nausea, if it occurred, has often begun to fade. You may start to notice the appetite-suppressing effects more clearly. Not necessarily a dramatic loss of hunger, but a quieting of food cravings and a greater sense of satisfaction with smaller portions. The naltrexone/bupropion combination produced improvements in participants' self-reported control of eating beyond those achieved with placebo.

This is also the week when some patients notice a subtle shift in their relationship with food-related rewards. Because the medication acts on the mesolimbic dopamine circuit, certain comfort foods or habitual snacking patterns may feel less compelling. This effect varies significantly between individuals, so don't be concerned if it doesn't happen for you on exactly this timeline.

Blood Pressure Monitoring Matters

The prescribing information indicates that patients may experience elevated blood pressure or heart rate during Contrave treatment, with the risk potentially greater in the first 3 months of therapy. If you aren't already monitoring your blood pressure at home, week three is a good time to start. A simple automated cuff from any pharmacy will do. Log your readings and share them with your prescriber at your next check-in. If you notice a sustained increase, report it promptly rather than waiting for a scheduled appointment.

Week 4 and Beyond: Reaching the Full Maintenance Dose

The Dose

At week four, both doses increase to two tablets, reaching the full maintenance dose of four tablets per day. That delivers 32 mg naltrexone and 360 mg bupropion daily. This is the maximum recommended dose; exceeding it is not advised and increases the risk of adverse effects, including seizure.

What the Clinical Evidence Shows

The phase 3 clinical trial program for Contrave tested this maintenance dose in thousands of participants. Patients receiving naltrexone/bupropion 32 mg/360 mg per day lost an average of 6.4% of their baseline body weight over 56 weeks, compared to 1.2% in the placebo group. More than half (50.5%) of treated participants achieved at least 5% body weight loss, versus 17.1% on placebo. Across all four phase 3 studies, the average weight loss ranged from approximately 11 to 22 pounds (5 to 9 kg).

The 12-Week Checkpoint

After 12 weeks on the full maintenance dose (roughly 16 weeks from your first tablet, accounting for the 4-week titration), your prescriber should assess whether you've lost at least 5% of your baseline body weight. If you haven't reached that threshold, the guidance is to discontinue Contrave because continued use is unlikely to yield clinically meaningful results.

Not every medication works for every patient. If Contrave isn't delivering results after a fair trial, that 12-week evaluation frees you and your doctor to explore other options without spending additional months on an ineffective regimen. For patients who are actively exploring physician-guided weight management, platforms like Harbor offer structured programs with clear start and end points, telehealth access to licensed physicians, and support from registered dietitians, an approach that can complement or follow a Contrave trial, depending on your clinical picture.

Contrave consultation shown as a female doctor in a white coat reviews information on a tablet with an overweight female patient in a bright clinic.

Comparison with Other Medications

Contrave’s dosing schedule is distinct from that of similar medications, particularly Wellbutrin (bupropion), even though they share bupropion as an active ingredient. While Contrave combines bupropion with naltrexone in a fixed-dose, extended-release formulation specifically for weight management, Wellbutrin is prescribed as monotherapy for mood disorders such as depression and comes in different strengths and dosing regimens. For example, Wellbutrin XL is typically started at 150 mg once daily and may be increased to 300 mg per day, while Contrave’s bupropion component reaches a maximum of 360 mg daily, divided into two doses and always paired with naltrexone. Importantly, the two medications are not interchangeable, as Contrave’s efficacy and safety profile rely on the synergistic effect of both ingredients. When considering a switch between Wellbutrin and Contrave, it is crucial to recognize that the presence of naltrexone introduces additional contraindications, most notably, the risk of precipitated opioid withdrawal and altered pain management if opioids are needed. There is no direct dose conversion between the two therapies, and the transition should always be guided by a healthcare professional, who will account for factors such as current medications, psychiatric history, and any potential for drug interactions.

What to Do if You Miss a Dose

One must understand what to do if a dose of Contrave is missed, as well as steps to take and symptoms to watch for in the event of an overdose. If you miss a dose, skip it and wait until your next regularly scheduled dose. Do not double up to compensate. Taking extra tablets to "catch up" increases the risk of seizure and other dose-related side effects. If you find yourself missing doses frequently, consider whether the issue is timing, routine, or something else. A pill organizer with AM/PM compartments, a phone alarm, or even tying the dose to an existing daily habit can help with consistency. Remember that bupropion has a relatively long half-life, so a single missed dose won't erase the medication's effects, but irregular dosing does undermine the steady-state drug levels the extended-release formulation is designed to maintain.

Critical Safety Considerations Throughout Treatment

Alcohol and Contrave

The combination of bupropion and alcohol is a significant safety concern. Bupropion can make your body more sensitive to the effects of alcohol, and excessive alcohol use increases seizure risk. Patients who drink heavily and then abruptly stop are at particularly elevated seizure risk and should discuss this with their prescriber before starting the medication. This doesn't necessarily mean total abstinence for every patient, but it does mean having an upfront conversation with your doctor about your drinking habits and being truthful about them.

Opioid Interactions

Because naltrexone is an opioid receptor antagonist, Contrave is contraindicated in patients currently using opioids. Taking Contrave while opioids are in your system can precipitate acute withdrawal, which may require emergency medical attention. If you need surgery or a medical procedure that typically involves opioid pain management, alert the surgical team that you are taking Contrave. You and your prescriber may need to plan a temporary discontinuation period before the procedure to allow the naltrexone to clear your system.

Seizure Risk Factors

Beyond the dose-related risk already discussed, certain populations carry higher seizure risk with bupropion: patients with a history of seizures or epilepsy, those with eating disorders, and individuals undergoing abrupt discontinuation of alcohol, benzodiazepines, or other sedatives. If any of these apply to you, your prescriber should factor them into the risk-benefit assessment before initiating Contrave.

Mental Health Monitoring

Bupropion carries an FDA black box warning regarding suicidal thoughts and behavior in young adults. While Contrave is approved for weight management rather than depression, the bupropion component means this warning still applies. Patients, family members, and caregivers should watch for new or worsening depression, anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, or suicidal ideation. Any such symptoms warrant immediate contact with the prescribing physician.

Special Populations: When the Standard Schedule Changes

Not every patient follows the standard four-week titration to four tablets daily. The dosing schedule may be modified for individuals with specific health conditions, such as renal or hepatic impairment, or when taking other medications. There are several populations that require a lower maximum dose. Patients with moderate or severe renal impairment should cap their dose at one tablet in the morning and one in the evening. Contrave is not recommended at all for patients with end-stage renal disease. The same two-tablet maximum applies to patients with moderate hepatic impairment, and Contrave is not recommended for those with severe liver impairment.

Patients taking CYP2B6 inhibitors, medications like ticlopidine or clopidogrel that affect how the liver metabolizes bupropion, should also limit their dose to two tablets daily, as these drugs can increase bupropion blood levels beyond what's intended. If you fall into any of these categories, your prescriber will likely modify the titration schedule accordingly. The adjustment is a safety measure to prevent drug accumulation and its associated risks. Considerations for long-term treatment with Contrave also involve knowing how long it may be used and how to safely discontinue therapy if needed.

Making the Titration Work: A Practical Checklist

The four-week ramp-up is not complicated, but it does require attention. Here's what sets successful patients apart from those who stall out before reaching the full dose:

Before you start: Have a candid conversation with your prescriber about all medications you're taking, your alcohol use, any history of seizures or eating disorders, and your kidney and liver function. These factors directly determine whether the standard schedule applies to you.
During the titration: Take each tablet with a modest meal. Not high-fat, not on an empty stomach. Keep a brief daily log of side effects, even minor ones, so you have concrete information to share at follow-up appointments rather than relying on memory. Stay hydrated. If nausea hits, go bland, go small, and go frequent with your meals.
At the full dose: Don't wait passively for weight loss to happen. Contrave is most effective when paired with dietary changes and physical activity. Track your weight weekly and bring your data to the 12-week evaluation.
Throughout treatment: Monitor your blood pressure, especially in the first three months. Report mood changes promptly. Don't stop Contrave abruptly without consulting your prescriber, and don't share the medication with anyone else. The dose and suitability depend on individual medical factors that only a physician can evaluate.

Contrave occupies a specific niche in the weight management landscape. It's FDA-approved for adults with a BMI of 30 or greater (or 27 or greater with at least one weight-related comorbidity like hypertension, type 2 diabetes, or dyslipidemia). It's not a GLP-1 receptor agonist like semaglutide or tirzepatide. It works through entirely different mechanisms, which makes it a viable option for patients who can't tolerate or access those newer medications.

Contrave weight loss progress tracked as a woman in a white crop top and gray sweatpants wraps a pink-numbered tape measure around her bare midsection.

Frequently Asked Questions

Starting Contrave can raise a lot of practical questions about daily use. Below, you’ll find concise answers to the most common questions about how to properly take Contrave, ensuring that you get the most benefit while minimizing side effects.

Can I take Contrave with food?

Yes, Contrave can be taken with or without food. However, avoid high-fat meals, as they can increase side effects by raising drug levels in your body.

What is the best time to take my Contrave doses?

Take your morning and evening doses at consistent times each day. There’s no exact required time, but spacing them about 12 hours apart is ideal for steady drug levels.

Should I swallow the tablet whole?

Always swallow Contrave tablets whole. Do not cut, crush, or chew them, as this can release the medicine too quickly and increase side effect risk.

What if I have trouble remembering my doses?

Set daily alarms, use a pill organizer, or tie your dose to an existing habit, like breakfast or brushing your teeth, to help you stay on track.

Can I drink alcohol while taking Contrave?

Limit alcohol while on Contrave, as it can increase certain risks, including seizures. Discuss your alcohol use with your doctor before starting the medication.

What should I do if I miss a dose?

If you miss a dose, skip it and take your next dose at the regular time. Never double up to make up for a missed dose.

Any tips for managing nausea or other side effects?

Eat smaller, bland meals and stay hydrated if you experience nausea. Contact your doctor if side effects are severe or persistent.

The four-week titration schedule is designed to give your body the best possible chance of tolerating the medication long enough to see results. Understanding what each week brings puts you in a far stronger position than going in blind and reacting to side effects as they arise. Weight management is rarely a linear process, and no single medication works for everyone. But if you've been prescribed Contrave, committing to the full titration schedule and giving the medication an honest 12-week trial at maintenance dose is the clearest path to knowing whether it's the right tool for you.

Sources: