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Conditions
Hypothyroidism(UnderactiveThyroid)
A condition where the thyroid gland does not produce enough thyroid hormones, causing fatigue, weight gain, cold intolerance, and mental sluggishness. More common in women and increases with age.
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6 min
avg cert turnaround
13 min
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approval rate
30%
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Symptoms
CommonsymptomsofHypothyroidism(UnderactiveThyroid)
Our doctors assess these symptoms online - no in-person visit required.
Fatigue and lethargy
Weight gain despite unchanged diet
Cold intolerance
Dry skin and hair
Constipation
Brain fog and poor concentration
Low mood or depression
Muscle aches and weakness
Heavy or irregular periods
Our Scope
Howwecanhelp
InstantMed handles many common conditions entirely online. Here's what fits our service.
What we can help with
- Prescription renewals for levothyroxine
- Dose adjustment based on thyroid function results
- Interpretation of thyroid function test results
- Medical certificates for thyroid-related symptoms
- Referral to endocrinologist if needed
What needs in-person care
- Initial thyroid assessment (requires blood tests and possibly imaging)
- Thyroid nodule assessment (requires ultrasound and possibly biopsy)
- Thyroid cancer management
Clinical Guidance
Whentoseeadoctor
These indicators suggest you should seek professional medical advice promptly.
Signs you need a doctor
- 1You need a medication review or dose adjustment
- 2Symptoms persisting despite treatment
- 3You need a thyroid function test request or result interpretation
- 4You need a prescription renewal for levothyroxine
- 5You are planning pregnancy and have thyroid disease
Seek emergency care if
- Myxoedema coma: severe hypothyroidism with confusion, hypothermia, and reduced consciousness (rare, life-threatening)
- Severe neck swelling with breathing difficulty
Call 000 or go to your nearest emergency department
Clinical Insight
Adoctor'sperspectiveonHypothyroidism(UnderactiveThyroid)
InstantMed Clinical Team
AHPRA Registered · Reviewed 2026-04
Hypothyroidism is one of the most common endocrine conditions I manage, and levothyroxine is straightforward -- but getting the dose right requires patience. TSH changes take 6-8 weeks to stabilise after a dose adjustment, so checking levels too early leads to unnecessary dose changes and a 'chasing the number' pattern. The most common reasons for persistent symptoms despite treatment are: incorrect dose (check TSH), poor medication absorption (taking with food or coffee), iron or vitamin D deficiency (screen for these), and concurrent depression. I also see many patients requesting 'natural thyroid' preparations (desiccated thyroid extract). While some patients prefer these, they contain variable T3/T4 ratios and are harder to dose consistently. Levothyroxine is synthetic but identical to human T4 and is the standard of care endorsed by all major endocrine societies.
Treatment
TreatingHypothyroidism(UnderactiveThyroid)
Levothyroxine replacement therapy is the standard treatment for hypothyroidism. The goal is to normalise TSH and relieve symptoms. Dosing is individualised based on weight, age, and TSH response. Most patients require lifelong treatment, though some with subclinical hypothyroidism may not need medication.
Levothyroxine
Eutroxsig, Eltroxin, Oroxine
Class:Synthetic thyroid hormone (T4)
Typical dose:Start 25-50mcg daily, titrate based on TSH (typical maintenance 75-150mcg)
PBS:PBS listed for hypothyroidism
- Standard of care for hypothyroidism endorsed by all major guidelines
- Synthetic T4 is identical to the hormone produced by the thyroid
- Dose adjustments should be made in 25mcg increments every 6-8 weeks
- Take on an empty stomach, 30-60 minutes before food, with water only
Liothyronine
Tertroxin
Class:Synthetic thyroid hormone (T3)
Typical dose:10-20mcg daily in divided doses (specialist-initiated only)
PBS:PBS listed for hypothyroidism (specialist recommendation preferred)
- Active thyroid hormone (T3) -- faster onset but shorter duration of action
- Used in combination with T4 in select patients with persistent symptoms
- Not recommended as sole therapy -- T3-only treatment causes unstable levels
- Specialist endocrinologist recommendation preferred before prescribing
Source: Therapeutic Guidelines - Endocrinology, 2024. This information is educational only and does not replace clinical assessment.
Specialist referral: Referral to an endocrinologist is recommended for persistent symptoms despite normal TSH, thyroid nodules requiring investigation, thyroid disease in pregnancy, complex dosing issues, or when T3 combination therapy is being considered.
Hypothyroidism (Underactive Thyroid) in Australia
Hypothyroidism affects approximately 1 in 33 Australians, with women 5-8 times more likely to be affected
Levothyroxine is one of the top 10 most dispensed medications in Australia
Hashimoto's thyroiditis is the most common cause of hypothyroidism in Australia
Subclinical hypothyroidism (mildly elevated TSH, normal T4) affects up to 10% of women over 60
Recovery
Whattoexpect
Typical recovery timeline and return-to-work guidance for most patients.
Typical recovery
Levothyroxine takes 4-6 weeks to reach steady state. Most patients notice improvement in energy and mood within 2-4 weeks of reaching the correct dose. Full symptom resolution may take 2-3 months. Some symptoms (dry skin, hair changes) take longer to resolve.
Return to work
Hypothyroidism rarely requires time off work. Severe fatigue at diagnosis may warrant a few days. Once on the correct dose, most people function normally. If fatigue persists despite normal TSH, investigate other causes.
When to reassess
TSH check 6-8 weeks after starting or changing dose. Once stable, annual TSH monitoring is sufficient. Recheck sooner if symptoms change, if pregnant or planning pregnancy, or if starting/stopping medications that affect thyroid absorption (iron, calcium, PPIs).
Self-Care
ManagingHypothyroidism(UnderactiveThyroid)athome
Evidence-based tips to support your recovery alongside medical treatment.
Take levothyroxine on an empty stomach, 30-60 minutes before breakfast, with water only
Keep at least 4 hours between levothyroxine and iron, calcium, or antacid supplements
Consistency matters more than timing -- take it at the same time every day
Do not switch brands without discussing with your doctor -- different brands have slightly different bioavailability
Get vitamin D and iron levels checked -- deficiencies are common with hypothyroidism and worsen fatigue
Regular exercise improves energy and mood even when thyroid levels are being optimised
FAQ
CommonquestionsaboutHypothyroidism(UnderactiveThyroid)
Answers to the most common questions from patients.
Testimonials
What patients say
Real experiences from Australians who've used InstantMed
Woke up with gastro at 6am, had my cert by 8:30. HR didn't question it.
Sarah M.
Verified
Half expected a rubber stamp tbh. It wasn't. The form asked proper questions and the doctor actually engaged with what I wrote.
Michelle T.
Verified
I work from home so ducking out to a clinic is a whole production. This saved me half a day easily.
Emma R.
Verified
Woke up with gastro at 6am, had my cert by 8:30. HR didn't question it.
Sarah M.
Verified
Half expected a rubber stamp tbh. It wasn't. The form asked proper questions and the doctor actually engaged with what I wrote.
Michelle T.
Verified
I work from home so ducking out to a clinic is a whole production. This saved me half a day easily.
Emma R.
Verified
Migraine hit at 7pm Sunday. Certificate was in my inbox before bed. Brilliant.
Chris P.
Verified
Missed an exam and needed a cert for special consideration. Done before my next lecture. The doctor asked follow-up questions too which made it feel legit.
Tom H.
Verified
Both kids were sick so I literally couldn't leave the house. Cert came through in about 45 mins. Didn't have to explain myself to anyone which was nice.
Priya N.
Verified
Migraine hit at 7pm Sunday. Certificate was in my inbox before bed. Brilliant.
Chris P.
Verified
Missed an exam and needed a cert for special consideration. Done before my next lecture. The doctor asked follow-up questions too which made it feel legit.
Tom H.
Verified
Both kids were sick so I literally couldn't leave the house. Cert came through in about 45 mins. Didn't have to explain myself to anyone which was nice.
Priya N.
Verified
Took closer to two hours than one, but still less time than sitting at a walk-in. Got there in the end.
Ben C.
Verified
Nearest GP is 45 mins drive. This genuinely fills a gap for people out here.
Mark D.
Verified
Gastro the night before a big work thing. Cert was in my inbox by 7am. Exactly what I needed.
Nick B.
Verified
Took closer to two hours than one, but still less time than sitting at a walk-in. Got there in the end.
Ben C.
Verified
Nearest GP is 45 mins drive. This genuinely fills a gap for people out here.
Mark D.
Verified
Gastro the night before a big work thing. Cert was in my inbox by 7am. Exactly what I needed.
Nick B.
Verified
Individual experiences may vary. All requests are subject to doctor assessment.
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