How GPs monitor ADHD medication: blood tests, heart checks, and follow-ups

Starting ADHD medication raises questions about safety monitoring. What blood tests do you need? Do you need a heart scan? How often should you see your GP once you are on medication? The answers are more straightforward than most patients expect. This guide walks through the baseline assessments, ongoing monitoring schedule, and what your GP checks at each follow-up appointment.

What this post covers

• Baseline assessments before starting medication
• Do you need an ECG before stimulants?
• What blood tests are (and are not) required
• Ongoing monitoring schedule
• What your GP checks at each review
• When your GP refers to a specialist

Baseline assessments before starting ADHD medication

Before prescribing any ADHD medication (stimulant or non-stimulant), your GP completes a set of baseline measurements. These establish your starting point so that any changes during treatment are detectable. The Australian evidence-based clinical practice guideline for ADHD recommends measuring:

• Blood pressure: recorded with an appropriately sized cuff and compared to normal ranges for your age
• Resting heart rate (pulse): stimulants increase heart rate by an average of 3-6 beats per minute, so knowing your baseline matters
• Weight and BMI: stimulants suppress appetite, and weight loss is one of the most common side effects to track
• Medical history review: personal and family history of cardiac conditions, seizures, liver disease, and psychiatric illness
• Current medication list: interactions with other drugs, particularly those affecting heart rhythm or blood pressure

This baseline assessment takes around 10-20 minutes and is part of your initial consultation.

Do you need an ECG before starting stimulants?

No, not routinely. Both the Australian ADHD guideline and the UK NICE guidelines are clear: an ECG is not needed before starting stimulants, atomoxetine, or guanfacine unless you have specific cardiac risk factors. Routine ECG screening in all ADHD patients is not supported by the current evidence and rarely changes management.

Your GP will order an ECG before prescribing if you have:

• A personal history of heart disease (structural or rhythm abnormalities)
• A family history of sudden cardiac death, particularly in a first-degree relative under 40
• Symptoms such as chest pain, palpitations, fainting, or unexplained breathlessness during exertion
• An existing condition treated with a medication that affects heart rhythm (QT prolongation risk)
• High blood pressure or an abnormal baseline heart rate

If none of these apply to you, an ECG is unlikely to be part of your pre-medication workup. If your GP does order one, it does not mean they are worried. It means they are being thorough based on something in your history.

What blood tests are (and are not) required

Your GP may request blood tests to check your general health, and to check for medical problems that may contribute to your symptoms. Examples of medical problems blood tests are used to detect include thyroid disorders, low iron and anaemia.

These are targeted investigations based on your clinical picture, not blanket screening. If your GP orders blood tests before starting ADHD medication, ask what they are checking for. The answer should be specific to your situation.

The ongoing monitoring schedule

Once you start ADHD medication, you will need frequent monitoring until your dose stabilises. The Australian guideline and RACGP recommendations follow this general pattern:

Titration phase (first 4-8 weeks)

During dose titration, you should see your GP weekly or fortnightly. Each visit covers:

• Symptom response: are your ADHD symptoms improving?
• Side effects: appetite, sleep, mood, heart rate, anxiety
• Blood pressure and pulse: checked at each visit
• Dose adjustment: your GP increases or adjusts the dose based on your response

This frequent contact during titration is normal and expected. It does not mean something is wrong. It takes time to find the right dose, and optimising medication requires feedback at each step.

Stabilisation phase (months 2-6)

Once your dose is stable and side effects are manageable, visits move to monthly. Your GP continues to monitor blood pressure, pulse, weight, and symptom response. This phase confirms that the medication is working consistently and that early side effects (particularly appetite suppression) are not causing significant weight loss.

Maintenance phase (6 months onward)

After six months of stable treatment, most patients move to reviews every three to six months. The guideline recommends measuring blood pressure, heart rate, and weight every six months at minimum. An annual comprehensive review should revisit the areas discussed when you started treatment and evaluate whether the current treatment plan is still appropriate.

Your GP should also ask annually whether you want to trial a medication break to reassess whether you still need treatment. This is not a test. It is part of good ongoing care.

What your GP checks at each review appointment

A good ADHD medication review covers more than blood pressure. At each review, your GP should assess:

• Symptom control: how are your core ADHD symptoms (inattention, impulsivity, restlessness) since the last visit? Standardised rating scales like the ASRS can track changes over time.
• Side effects: appetite and weight changes, sleep quality, mood (including anxiety and irritability), dry mouth, headaches
• Cardiovascular: blood pressure and resting heart rate, compared to your baseline
• Weight: adults on stimulants should have weight and BMI tracked at every review. Significant unintentional weight loss warrants dose review or dietary support.
• Mental health: ADHD medications do not treat comorbid anxiety or depression directly. Your GP should screen for worsening of these conditions, particularly in the first few months.
• Functional improvement: is the medication helping in the areas that matter to you? Work performance, relationships, daily task completion, emotional regulation.
• Medication adherence: are you taking it consistently? If not, why not? Barriers to adherence (cost, side effects, forgetting) need to be addressed, not judged.

If your GP is not covering these areas, bring them up yourself. You are entitled to a thorough review, and the information you provide directly shapes your treatment plan.

When your GP refers to a specialist

Most ADHD medication management happens in general practice. Your GP refers to a specialist when the situation falls outside routine management:

• Cardiology referral: if you develop sustained tachycardia (resting heart rate above 120 bpm), arrhythmias, or systolic blood pressure elevation confirmed on two separate occasions
• Psychiatry referral: if comorbid conditions (severe anxiety, bipolar disorder, substance use) complicate medication management, or if you have not responded adequately to two or more medications
• Dietitian referral: if stimulant-related appetite suppression is causing clinically significant weight loss or nutritional deficiency. Optimising your diet even if you have not lost weight can help to control symptoms of ADHD
• Sleep specialist referral: if medication-related insomnia persists despite dose timing adjustments and sleep hygiene measures

Referral is not a failure of GP management. It is your GP recognising when a specific area needs focused attention from someone with additional training in that domain.

ADHD medication monitoring is less onerous than most patients expect. The most important thing you bring to each review is honest feedback about how the medication is working in your actual life. If you are starting the process and want to understand the full assessment pathway, book an ADHD assessment and book with a GP who follows the evidence-based monitoring guidelines from the start.