A Shared Decision-Making Guide
This handout summarises medications that can help with concentration, mental fog, and low mood. It is meant to support a conversation with your doctor — not replace one. All medications have trade-offs, and the right choice depends on your situation.
1. Bupropion (Wellbutrin)
What it does: Boosts dopamine and noradrenaline — the brain chemicals involved in motivation, drive, and focus. Licensed for smoking cessation aid, but can be prescribed for mood and inattention off -label.
| ✅ Pros | ❌ Cons |
|---|---|
| Improves focus and mental energy | Can cause insomnia if taken too late in the day |
| Helps with low mood and motivation | May increase anxiety in some people |
| Strong effect on anhedonia and drive — one of the best options if you've lost enjoyment or motivation | Lowers seizure threshold — not suitable if you have epilepsy or an eating disorder |
| No sexual side effects | Takes 4–6 weeks to feel the full benefit |
| No weight gain (often mild weight loss) | Not suitable if you drink heavily |
| Once or twice daily |
Typical dose: Start at 150mg in the morning, may increase to 300mg
2. Agomelatine (Valdoxan)
What it does: Works on the brain's sleep-wake system and mood centres. Unusual in that it actively improves sleep quality rather than disrupting it.
| ✅ Pros | ❌ Cons |
|---|---|
| Actively improves sleep quality | Liver function tests needed regularly (baseline, 6 weeks, 12 weeks, then 6-monthly) |
| Helps with low mood and cognitive fog | Not covered by PBS — costs approximately $60–80/month |
| Moderate effect on motivation and anhedonia — better than SSRIs in this domain | Less evidence than older antidepressants |
| No sexual side effects | Alcohol should be avoided |
| No weight gain | |
| No withdrawal syndrome |
Typical dose: 25mg at night, may increase to 50mg
3. Fluoxetine (Prozac)
What it does: Increases serotonin. One of the most studied antidepressants. A reasonable option when mood is the main concern.
| ✅ Pros | ❌ Cons |
|---|---|
| Very well studied — decades of safety data | Less effective for cognitive fog specifically |
| Long half-life — missing a dose matters less | Can worsen emotional blunting and anhedonia in some people — important to monitor |
| Once daily | Can cause insomnia or vivid dreams |
| Good for anxiety alongside depression | Sexual side effects are common |
| PBS-listed | Interacts with many other medications |
| Takes 4–6 weeks to work |
Typical dose: 20mg in the morning, may increase to 40–60mg
4. Atomoxetine (Strattera)
What it does: Increases noradrenaline in the brain's planning and focus centres. Specifically designed for attention difficulties.
| ✅ Pros | ❌ Cons |
|---|---|
| Non-stimulant — no dependence risk | Slow to work — takes 4–8 weeks for full effect |
| Once daily | Requires a formal ADHD diagnosis in Australia/New Zealand |
| Can help with emotional regulation | Can cause nausea, reduced appetite, or dry mouth |
| Mild improvement in motivation via noradrenaline — less direct than bupropion | Rare but serious liver effects — monitoring needed |
| No sleep disruption if taken in the morning | Not suitable for people on certain other medications |
Typical dose: Start 40mg, increase to 80–100mg over 4–6 weeks
5. Guanfacine (Intuniv)
What it does: Calms overactivity in the brain's attention centres, particularly helpful if you feel mentally "revved up" or emotionally reactive.
| ✅ Pros | ❌ Cons |
|---|---|
| Improves focus and emotional steadiness | Requires ADHD diagnosis for standard prescribing |
| Often improves sleep quality | Can cause drowsiness, especially at first |
| No dependency risk | Blood pressure monitoring required |
| Useful if anxiety and attention issues overlap | Must be tapered slowly — stopping suddenly can raise blood pressure |
| Modest effect on emotional reactivity — helps with frustration and overwhelm, but limited direct effect on anhedonia or motivation |
Typical dose: Start 1mg at night, increase slowly to 2–4mg
6. Venlafaxine (Effexor XR)
What it does: Works on both serotonin and noradrenaline — good for mood, anxiety, and cognitive symptoms together.
| ✅ Pros | ❌ Cons |
|---|---|
| Effective for depression and anxiety together | Can cause nausea, especially when starting |
| Improves concentration at higher doses | Insomnia or vivid dreams are common early on |
| Moderate effect on motivation at higher doses (≥150mg) when noradrenaline effect kicks in | Stopping abruptly causes withdrawal symptoms — must taper slowly |
| Once daily | Sexual side effects possible |
| Good evidence base | Blood pressure monitoring needed at higher doses |
Typical dose: Start 75mg, increase to 150–225mg over several weeks
At a Glance
| Medication | Focus | Mood | Anhedonia / Motivation | Sleep Friendly | Needs Diagnosis |
|---|---|---|---|---|---|
| Bupropion | ✅✅ | ✅✅ | ✅✅ | ⚠️ take early | No |
| Agomelatine | ✅ | ✅ | ✅ | ✅✅ | No |
| Fluoxetine | ➖ | ✅ | ⚠️ may worsen | ⚠️ | No |
| Atomoxetine | ✅✅ | ➖ | ✅ | ✅ | Yes (ADHD) |
| Guanfacine | ✅✅ | ➖ | ➖ | ✅✅ | Yes (ADHD) |
| Venlafaxine | ✅ | ✅✅ | ✅ (at ≥150mg) | ⚠️ early weeks | No |
This document is for discussion purposes only. Your doctor will help determine the most appropriate option based on your full medical history, other medications, and personal preferences.
