When beginning naltrexone for alcohol reduction, treatment often starts at a lower introductory dose before moving to the standard therapeutic dose.
This approach — known as dose titration — is widely used in medicine to help the body adjust gradually to a new medication.
Naltrexone works by blocking opioid receptors in the brain, reducing the rewarding effect of alcohol. While this mechanism is well tolerated by most people, introducing it slowly can help minimise early side effects.
Starting with low-dose naltrexone allows:
- The body to adapt more comfortably
- Reduced likelihood of nausea
- Lower risk of sleep disturbance
- Greater treatment adherence
- Increased patient confidence
After an introductory period, the dose is usually increased to 25mg, and in some cases up to 50mg if clinically appropriate.
This gradual step-up process ensures the neurological effects of naltrexone can begin without overwhelming the system.
From a behavioural perspective, beginning at a lower dose also helps individuals ease into the process of alcohol reduction. It provides time to observe how drinking patterns shift as the brain’s reward pathway begins to change.
Importantly, dose adjustments should always follow clinician guidance. Naltrexone is a prescription medication in the UK, and prescribing decisions are based on medical history, tolerability, and treatment goals.
Research and clinical practice both support the use of low-dose initiation as a safe and effective way to begin alcohol reduction therapy.
By starting gently and building gradually, individuals are more likely to remain consistent — allowing the long-term neurological benefits of naltrexone to take effect.
Read more on our What is Naltrexone Page