Medicines and prescriptions
What Is Prophylaxis? Preventive Treatment Explained
Prophylaxis · say it: proh-fuh-LAK-sisAlso written: preventive treatment, prophylactic, preventative therapy
Short answer
Prophylaxis means treatment given to prevent a disease or problem, rather than to treat one you already have.
What it means
Prophylaxis means prevention. A prophylactic medicine is taken to stop something from happening, such as an infection, a blood clot, a migraine or malaria, rather than to treat an illness that has already started.
Labels use the word under 'Indications' (for example 'prophylaxis of malaria' or 'prophylaxis of deep vein thrombosis after surgery'). The dose and length of a preventive course can be different from a treatment course, which is why the label separates them. Antibiotics are sometimes given as prophylaxis before some surgery or dental procedures.
Prophylaxis (prevention) is different from treatment. 'Post-exposure prophylaxis' means preventive treatment started soon after possible contact with an infection, such as rabies or HIV.
Where you may see it
- The 'Indications' and 'Dosage' sections of medicine labels
- Discharge summaries ('VTE prophylaxis')
- Travel clinic letters
📄 How it looks on a report
Indicated for the prophylaxis of deep vein thrombosis in patients undergoing hip replacement surgery.
🙅 What it does not mean
- It does not mean you already have the condition.
- It does not give complete protection; it lowers the chance.
- A preventive dose is not the same as a treatment dose; do not swap between them.
🎯 Check yourself
Which of these is the right meaning of “Prophylaxis”?
🗒️ Questions to ask your doctor
🧾 Reports where you will see “Prophylaxis”
Paste or upload the report and every line of it is explained, with personal details removed first.
💊 Medicines whose labels mention “Prophylaxis”
Plain-English explanations of each medicine, from its official FDA label.
- Allopurinol
a xanthine oxidase inhibitor, a prescription medicine that acts on uric acid
- Amitriptyline
An antidepressant of the tricyclic type
- Amoxicillin and Clavulanate Potassium
A penicillin-class antibacterial combined with a beta-lactamase inhibitor, as the label describes it
- Colchicine
an alkaloid medicine, a compound obtained from the autumn crocus plant (colchicum autumnale)
- Divalproex Sodium
An anti-epileptic (anti-seizure) drug of the valproate type. The label also uses it to treat manic episodes of bipolar disorder and to prevent migraine headaches.
- Hydroxychloroquine
an antimalarial and antirheumatic drug, which means it is used for malaria and for certain joint and immune conditions
- Oseltamivir
An influenza neuraminidase inhibitor, a type of antiviral medicine used against the flu
🔗 Read more from trusted sources
- “Prophylaxis” on MedlinePlus ↗
US National Library of Medicine
- NCI Dictionary definition ↗
US National Cancer Institute: “prophylaxis”
Seeing this word on your own report? Get every line of it explained, free.
Explain my report🧩 Related words
🔎 Look up another word
More words: medicines and prescriptions
General information about a medical word, not advice about your own results. Ask the clinician who ordered the test what it means for you.