First-Line Treatments Every Medical Student Should Know
Knowing the standard first-line treatment for common conditions is high-yield for exams and the wards. The list below summarises widely used first-line options based on major guidelines (WHO, NICE, CDC). Always confirm against your local protocols — recommendations vary by country and are updated regularly.
Cardiovascular
- Hypertension — lifestyle measures for all; first-line drugs are an ACE inhibitor or ARB (for those under 55 and not of African/Caribbean origin), or a calcium-channel blocker (for those over 55 or of African/Caribbean origin).
- Heart failure with reduced ejection fraction — an ACE inhibitor (or ARB) plus a beta-blocker licensed for heart failure, with an aldosterone antagonist and SGLT2 inhibitor added as indicated.
Endocrine
- Type 2 diabetes — lifestyle plus metformin as first-line drug therapy; add an SGLT2 inhibitor early in patients with cardiovascular or renal disease.
- Hypothyroidism — levothyroxine, titrated to normalise TSH.
Respiratory
- Asthma — an inhaled corticosteroid (ICS) is the foundation; modern guidance favours ICS-formoterol as combined maintenance and reliever therapy rather than a short-acting beta-agonist alone.
- COPD — smoking cessation above all; a long-acting bronchodilator (LABA or LAMA), with ICS added for frequent exacerbations or eosinophilia.
Infection
- Uncomplicated UTI — nitrofurantoin or trimethoprim (guided by local resistance), short course.
- Community-acquired pneumonia (low severity) — amoxicillin (or a macrolide/doxycycline if penicillin-allergic).
How to actually remember these
Don't memorise lists in isolation. For each condition, tie the first-line drug to its mechanism and the reason it's first-line (efficacy, safety, cost, evidence). Understanding why metformin is first-line in type 2 diabetes makes it far stickier than rote recall — and helps you reason when a patient can't take it.
Want the reasoning, not just the list?
Ask Aboy AI "why is metformin first-line for type 2 diabetes?" and get a cited explanation with the mechanism — tailored to your level.
Try Aboy AI freeFrequently asked questions
What is the first-line treatment for type 2 diabetes?
Lifestyle change plus metformin, with an SGLT2 inhibitor added early in those with established cardiovascular or kidney disease.
Do first-line treatments differ between countries?
Yes. Guidelines from WHO, NICE, CDC and others differ in detail and are updated regularly, so always check the guideline relevant to your setting.
This article is for education only and is not medical advice or a prescribing guide. Treatment decisions must follow current guidelines and qualified clinical judgment.