What to Expect in the First 4 Weeks on ADHD Medication

Medication is not appropriate for everyone with ADHD, but for some people it can be life changing. As with any treatment, results vary across individuals. If your GP prescribes medication, it is important to be aware of possible effects and side effects. This guide covers what to expect week by week for the three stimulant medications prescribed in Australia: lisdexamfetamine (Vyvanse), dexamphetamine, and methylphenidate (Ritalin, Concerta). Other medications that are not stimulants sometimes prescribed for ADHD, but stimulants are the most common first line medication. Knowing what is normal helps you stick with the process and recognise when something needs your GP’s attention.

In this article

• How titration works in Australia
• Week 1: starting the lowest dose
• Week 2: early adjustments
• Weeks 3 and 4: finding the right dose
• Common side effects and when they settle
• When to contact your GP
• Frequently asked questions

How titration works in Australia

Titration is the process of starting a medication at the lowest effective dose and gradually increasing it until symptoms improve without unacceptable side effects. Your GP increases the dose in small, measured steps, based on your feedback about symptom control and tolerability.

The Australian ADHD Clinical Practice Guideline (AADPA) recommends that the first medication for most adults should be a stimulant, with dose increases guided by patient response. Monthly follow-up appointments are standard during titration, though some GPs will check in weekly by phone or telehealth during the first month.

Each stimulant has a different titration schedule:

• Vyvanse (lisdexamfetamine): usually starts at 30 mg daily. Maximum TGA-approved dose is 70 mg.
• Dexamphetamine: usually starts at 2.5–5 mg in the morning, with a second dose added at lunchtime after a few days. Increased by 2.5–5 mg per week. Maximum dose under Queensland regulations is 40 mg daily without additional approval.
• Methylphenidate (Ritalin IR): typically starts at 5 mg twice daily, increased by 5–10 mg per week. Maximum dose is 60 mg daily for immediate-release. Extended-release forms (Concerta, Ritalin LA) follow similar principles with different dose increments.

Week 1: starting the lowest dose

The first week is about establishing a baseline. Your GP starts you on the lowest dose to see how your body responds before making any changes. You are not expected to feel the full therapeutic effect at this stage.

What you might notice in week 1:

• Mild appetite suppression: most people notice reduced hunger, particularly around lunchtime. This is the single most common side effect across all three stimulants.
• Slight difficulty falling asleep: especially with afternoon doses of dexamphetamine or if you take Vyvanse later than early morning.
• A sense of calm or focus: some people describe feeling quieter in their mind. Others feel little difference at the starting dose.
• Dry mouth: common across all stimulants. Staying hydrated helps.
• Mild headache or nausea: these typically resolve within the first few days.

If you experience no benefit at all in week 1, that is expected. The starting dose is deliberately low. Your GP will assess your response before increasing.

Week 2-4: early adjustments

Around week 2-4, your GP may increase your dose if the starting dose was tolerated but not effective.

What changes in week 2:

• Side effects from week 1 often settle: headaches and nausea that appeared in the first few days usually resolve as your body adjusts.
• Appetite suppression may persist: this tends to be ongoing rather than temporary. Eating a protein-rich breakfast before your medication helps.
• You might notice the medication wearing off: with short-acting dexamphetamine (3–4 hours) or methylphenidate IR (3–4 hours), you will feel a clear drop in focus as the dose wears off. Long-acting Vyvanse (10–12 hours) and Concerta (10–12 hours) provide smoother coverage.
• Emotional changes: some people feel more emotionally reactive or experience a mood dip as the medication wears off (called “rebound”). Note the timing and tell your GP.

Keep a brief daily log of when the medication feels active, when it wears off, and any side effects. This information is invaluable for your GP when adjusting the dose.

Weeks 4 onwards: finding the right dose

Weeks 3 and 4 are when most people reach a dose that provides meaningful symptom improvement. Your GP continues to adjust based on the balance between benefit and side effects. The goal is the lowest dose that gives you good symptom control with tolerable side effects.

By this stage, you should be able to answer these questions for your GP:

1. How many hours of focus does each dose give you?
2. Are your core ADHD symptoms (inattention, restlessness, impulsivity) noticeably reduced?
3. Are side effects stable, worsening, or improving?
4. Is the medication wearing off too early in the day?
5. How is your sleep?

If the current stimulant is not providing adequate benefit after a reasonable trial at an appropriate dose, your GP might switch to a different stimulant. Responding poorly to one stimulant does not predict your response to another. Roughly 70–80% of adults with ADHD respond well to at least one stimulant medication.

Common side effects and when they settle

Most stimulant side effects are mild and dose-dependent, meaning they tend to worsen with dose increases and settle within 1–2 weeks at each new dose level. The AADPA guideline notes that side effects should be monitored at every follow-up, with strategies to manage them rather than immediately stopping medication.

• Appetite suppression: persists for most people but becomes manageable. Eat before taking medication, plan nutrient-dense snacks, and eat a larger evening meal when appetite returns.
• Sleep disruption: take medication early in the day. Avoid doses after 2 pm for short-acting stimulants. Vyvanse should be taken first thing in the morning. If insomnia persists, your GP might adjust timing or consider a lower afternoon dose.
• Increased heart rate: a small increase (5–15 bpm) is common and usually not clinically significant. Your GP will check your blood pressure and pulse at each review.
• Dry mouth: stays consistent. Keep water accessible throughout the day.
• Mood changes or emotional blunting: feeling “flat” or less emotionally responsive may indicate the dose is too high. This is a sign to discuss with your GP.

When to contact your GP

Contact your GP before your next scheduled appointment if you experience any of the following:

• Chest pain, palpitations, or a resting heart rate consistently above 100 bpm
• Severe anxiety or panic attacks that were not present before starting medication
• Significant mood changes: persistent low mood, irritability, or emotional numbness
• Involuntary movements or tics that develop after starting treatment
• Inability to sleep despite taking medication early in the day
• Significant weight loss (more than 5% of body weight in the first month)
• Thoughts of self-harm or suicidal ideation

These symptoms do not necessarily mean the medication is wrong for you. They often indicate the dose needs adjusting, the timing needs changing, or a different stimulant would suit you better. Your GP is there to troubleshoot, not to judge.

If you are a patient of a Velluto-powered GP, your pre-consultation preparation includes structured follow-up questionnaires that help your GP track side effects and symptom improvement between appointments.

Frequently asked questions

The first four weeks on ADHD medication are a process of adjustment, not a pass-or-fail test. Side effects that appear in week 1 often settle by week 3. A dose that feels underwhelming on day 2 is supposed to: your GP is building up gradually. The most useful thing you can do is track your response, communicate openly with your GP, and give the titration process time to work. If you are ready to start the process, book an ADHD assessment as a first step.