How to Prepare for a CT Scan

November 2, 2025 · 3 min read · Light Radiology Team · CT Scans

This guide outlines how to prepare for your CT scan, including what to wear, eating and drinking instructions, and information about contrast dye. Following these steps helps ensure accurate images and a smooth appointment.

New to CT? Read What Is a CT Scan and How Does It Work? for a simple overview before your appointment.

Check your referral

Your referral form or booking confirmation will specify whether your scan requires contrast. Preparation can differ depending on the type of CT ordered by your doctor.

Unsure why CT was requested? See Why Your Doctor Might Refer You for a CT Scan.

General preparation

Bring your referral, Medicare card, and any previous imaging if available.
Arrive 10–15 minutes before your appointment to complete forms.
Wear loose, comfortable clothing without metal zips, belts, or buttons.
Leave jewellery, watches, and piercings at home when possible.
Continue taking your usual medications unless instructed otherwise.

Fasting and hydration

If your scan uses contrast, avoid eating for 2–4 hours before your appointment.
Drink water to stay hydrated; clear fluids are usually fine.
If your scan does not use contrast, you can generally eat and drink normally.

Learn how contrast affects preparation in CT Scan with Contrast vs Without Contrast.

Patients with diabetes or kidney conditions

Tell us if you have diabetes or kidney problems. These conditions can affect how your body handles contrast dye.
If you take metformin, you may need to pause it temporarily after your scan. We will give specific instructions.
Bring a list of current medications with you.

Contrast injection preparation

For contrast scans, a small IV cannula will be placed in your arm.
Let staff know if you have had any reaction to iodine contrast before.
Inform us of asthma, allergies, thyroid disease, or if you are pregnant or breastfeeding.

For more on safety, read Are CT Scans Safe?

Pregnancy and children

If you are or might be pregnant, inform us before your scan. We will assess whether CT is necessary or suggest an alternative such as ultrasound or MRI.
For children, we tailor scanning protocols to keep radiation dose as low as possible.

On the day of your scan

Arrive a few minutes early to complete your questionnaire.
Remove metal items and change into a gown if required.
If contrast is used, you will have a brief consultation before the injection.
Relax and follow the radiographer’s instructions during the scan.

Curious what happens during the scan? Read What to Expect During a CT Scan.

After your scan

If you had contrast, drink extra water through the day to help flush it from your body.
You can eat, drink, and resume normal activities immediately unless told otherwise.
If you notice redness, swelling, or pain at the injection site, contact us or your GP.

Quick checklist

Referral and Medicare card ready
Loose, metal-free clothing
Follow fasting instructions if contrast is used
Drink water before and after
Arrive early to allow time for paperwork

In summary

Most CT scans require little preparation. Following these simple steps helps ensure clear images and a safe, efficient experience. If you are unsure about fasting, medications, or contrast, contact our team before your appointment.

Buy Amoxil Online: What You Need To Know Before You Order. Visit Our Pharmacy ↓

Amoxil (Amoxicillin) in Australia: A GP’s Practical Review for Adults Over 30

Attention: If you are over 30, a bacterial infection is never just a small problem. A chest infection, sinus infection, dental abscess, or severe sore throat can steal your sleep, your focus, your income, and your ability to care for your family. You may be managing a mortgage, shift work, ageing parents, or a chronic condition such as high blood pressure, diabetes, or arthritis. Every missed day of work matters. You need an antibiotic that works, is affordable, and does not create a new set of problems such as severe diarrhoea, dizziness, or unexpected drug interactions. In my clinical practice, Amoxil is very often that antibiotic.

Interest: What Exactly Is Amoxil?

The Amoxil generic name is amoxicillin. Amoxicillin belongs to the penicillin class of antibiotics. It works by damaging the cell wall of susceptible bacteria, causing the bacteria to die. Amoxil is not a new, experimental medicine. It has been used safely and effectively for decades, which means Australian doctors know its benefits, its limitations, and its side-effect profile extremely well.

Amoxil is commonly prescribed for bacterial infections of the chest, sinuses, throat, ears, teeth, and urinary tract. For many otherwise healthy adults, it remains a first-line option because it is targeted enough to treat the infection while generally being gentler on the gut than some broad-spectrum alternatives.

Why the PBS listing matters for Australians: Amoxil PBS listing in Australia means that amoxicillin is subsidised under the Pharmaceutical Benefits Scheme for approved bacterial infections. For most patients with a Medicare card, this keeps the cost to the standard PBS co-payment rather than a private prescription price. This is an important saving for adults over 30 who are already paying for blood pressure tablets, cholesterol medication, diabetes supplies, or family health costs.

Quick facts: Amoxil at a glance
Feature	Details
Brand name	Amoxil
Generic name	Amoxicillin
Drug class	Penicillin antibiotic
PBS listing in Australia	Yes — available for approved bacterial infections; reduced PBS co-payment applies for eligible patients
Common adult forms	Capsules, chewable tablets, and oral suspension
Typical adult dose	250 mg–500 mg every 8 hours, or 500 mg–875 mg every 12 hours depending on the infection and your kidney function
Driving caution	Usually safe for driving, but avoid driving if you feel dizzy, light-headed, confused, or unwell

Desire: Practical Benefits and Real-World Safety Points

As a doctor, I do not just think about whether a drug kills bacteria. I think about whether it fits your life. Can you still work? Can you drive? Will it interact with your gout or arthritis medicines? Will it cause gut problems? Below are the key points I discuss with my patients over 30 before prescribing Amoxil.

Amoxil and Driving Caution

Most people taking Amoxil can drive normally. However, amoxicillin can occasionally cause dizziness, light-headedness, confusion, or fatigue, especially during the first 24–48 hours of treatment. The risk may be higher if you are dehydrated, taking high doses, or have reduced kidney function. My advice is simple: do not drive or operate heavy machinery until you know how Amoxil affects you. If you feel “not quite right,” wait and speak with your pharmacist or doctor. A short antibiotic course is not worth a road accident.

Amoxil and Clostridium difficile

Any antibiotic can disturb the normal bacteria in your bowel and allow Clostridium difficile to overgrow. This can cause diarrhoea ranging from mild to severe colitis. Warning signs include frequent watery stools, a foul smell, abdominal cramps, fever, or blood in the stool. If you develop these symptoms while taking Amoxil, or even within several weeks after finishing, stop the antibiotic and contact your doctor or go to an emergency department immediately. Do not self-treat with anti-diarrhoeal tablets unless your doctor tells you to, because slowing the gut can make C. difficile infection worse.

Amoxil and Allopurinol

If you take allopurinol for gout, tell your doctor before starting Amoxil. The combination of amoxicillin and allopurinol can increase the chance of developing a non-allergic skin rash. This does not mean you cannot use Amoxil. It means your GP will weigh the benefits, monitor for any rash, and may choose an alternative antibiotic if you have a history of skin reactions. Never stop allopurinol on your own, because sudden changes in uric acid levels can trigger a painful gout flare.

Amoxil and Methotrexate Interaction

For patients taking methotrexate for rheumatoid arthritis, psoriatic arthritis, or other autoimmune conditions, amoxicillin can reduce how quickly the body clears methotrexate. This may increase methotrexate toxicity, leading to mouth ulcers, low blood cell counts, or liver irritation. If you are on methotrexate, your doctor will monitor you closely, may arrange blood tests, and may temporarily adjust your methotrexate dose while you are taking Amoxil. Always mention methotrexate when any doctor prescribes an antibiotic for you.

Amoxil and Histamine Release

Some patients notice itching, flushing, or hives while taking amoxicillin. This can occur because amoxicillin may trigger histamine release from certain immune cells, even without a true penicillin allergy. In many cases this is mild and settles with an antihistamine, but you should report it to your doctor. However, if you develop swelling of the lips or tongue, difficulty breathing, wheezing, or feel faint, call 000 immediately — this may be anaphylaxis, a medical emergency.

Desire: Amoxil vs Augmentin — Why Less Can Be More

Many patients ask me: “Doctor, why not just give Augmentin? Isn’t it stronger?” Augmentin contains amoxicillin plus clavulanate. Clavulanate helps overcome certain resistant bacteria, but it is not always needed. Using broader antibiotics when they are not required can increase side effects such as diarrhoea, thrush, and antibiotic resistance. Amoxil vs Augmentin is not about “stronger”; it is about the right tool for the job. For many community-acquired infections in otherwise healthy adults, Amoxil remains first-line because it is effective and gentler on the gut.

Amoxil vs Augmentin: which one does your GP choose?
Feature	Amoxil (amoxicillin)	Augmentin (amoxicillin + clavulanate)
Coverage	Narrower, targeted treatment	Broader, covers certain beta-lactamase-producing resistant bacteria
Common uses	Strep throat, sinusitis, dental abscess, simple chest infection	Resistant ear/sinus/chest infections, animal bites, some skin infections
Side effect profile	Often less diarrhoea and less yeast overgrowth	May cause more digestive upset or thrush
Cost on PBS	Usually lower	Usually slightly higher
Antibiotic stewardship	Preferred when narrower coverage is appropriate	Reserved for when broader coverage is truly needed

Action: How to Access Amoxil Safely in Australia

If you are over 30 and struggling with a suspected bacterial infection — a severe sore throat, sinus pressure, persistent chest cough, or dental infection — do not lose another day of work or sleep. Book a telehealth or face-to-face GP appointment. Your doctor will assess whether Amoxil is appropriate for you, check your other medicines, and write a prescription.

Because Amoxil is listed on the PBS, you can fill your prescription at any Australian pharmacy for a standard PBS co-payment if you are eligible. Ask your pharmacist about the best way to take it, whether to take it with food, and what to do if you miss a dose. Always complete the full course unless your doctor stops it earlier, even if you start feeling better after a few days.

Amoxil has earned its place in Australian medicine for good reason: it is affordable, well-tolerated, and effective when used correctly. With sensible precautions around driving, gut health, and drug interactions, it can help you get back to work, back to your family, and back to normal life faster.

This article is general information from a doctor’s perspective and does not replace individual medical advice. Always consult your GP or pharmacist before starting, stopping, or changing any medicine.

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