Medication

Doxycycline

An oral antibiotic for moderate to severe inflamed acne. It is meant as a short bridge alongside topical treatment, not a long-term drug.
Dr. Schwarz, MD · Board-certified dermatologistLast reviewed August 23, 2026
An amber prescription bottle lying on its side on a white background with a plain white label reading Doxycycline, and six small round white tablets spilled out in front of it.

Start here

Doxycycline is the oral antibiotic dermatologists reach for most. We are trying to use fewer oral antibiotics for acne, but a short course still works for severe acne. Take it with food or it will make you nauseated. It also makes you burn easily — I have seen bad sunburns on it.

— Dr. Schwarz, Board Certified Dermatologist

Key Facts

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Also calledVibramycin, Doryx, Acticlate, Targadox, Oracea
Drug classTetracycline-class oral antibiotic
Taken asTablet or capsule
Typical courseAbout 3 to 4 months
Time to work4 to 8 weeks
Prescription onlyYes

What It Is

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Doxycycline is an antibiotic taken by mouth, part of the tetracycline family, used for infections since the 1960s. In skin it treats moderate to severe inflammatory acne, rosacea, and a few other conditions. For acne it is always paired with topical treatment, never used alone.

How It Works

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Doxycycline blocks bacteria from making proteins, slowing the growth of Cutibacterium acnes in the pore. At acne doses it also works directly on inflammation, turning down the enzymes and signals that make a spot swollen and painful.

The anti-inflammatory effect matters more. Doses far too low to kill bacteria still reduce acne and rosacea, which is also why doxycycline helps where some resistance exists. It never works alone, because it does nothing about the clog that starts the spot.

Here is where Doxycycline acts in the skin, and what the others do instead.

About Doxycycline
Compare
Skin basics
BARRIEREPIDERMISDERMISPOREOILGLANDKILLS BACTERIAARRIVES BY BLOODSTOPS PLUGS FORMINGUNCLOGS THE POREKILLS YEASTLOWERS OIL PRODUCTIONKILLS MITES

Doxycycline works on the bacteria growing in an inflamed pore. Less bacteria means less for the immune system to react to, which is what takes the redness and soreness out of a spot. At acne doses it works on the inflammation as much as the bacteria.

Doxycycline arrives from the inside, carried to the skin by the blood, rather than crossing the barrier from outside. That is why it works everywhere at once, and why it needs monitoring.

Retinoids change how the lining of the pore sheds its cells, so the plug that starts a spot stops forming in the first place. That is why they prevent spots rather than treat the ones already there, and why the first weeks can look worse before they look better.

Salicylic acid dissolves in oil, so it gets down inside the pore rather than sitting on the surface, and loosens the plug of dead skin and sebum blocking the way out.

The yeast involved here lives on everyone's skin and only causes trouble when it overgrows in oil. This reduces it, which is why the flaking and itching settle and why it comes back if treatment stops for good.

This works upstream of the spot, on the gland itself. Less oil means fewer plugs, less for bacteria to feed on and less inflammation, which is why it changes the pattern rather than clearing one spot.

Everyone carries these mites in their follicles. In some people the immune system reacts to them, and reducing their number reduces the bumps and the redness that come with them.

The outer film of dead cells and oil. It holds water in and keeps irritants out, and it is thinner than a sheet of paper. Almost every dry, itchy, stinging skin problem starts here.

The outer layer, and the only one anything in a jar reaches. It renews itself constantly: a cell made at the bottom takes about a month to reach the surface and flake off. Most of what a skincare product does, it does here.

The living layer underneath, holding the blood vessels, the nerves and the collagen. It is where lasting change happens and it is hard to reach: most of what is sold for the skin never gets this far.

What It Treats

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Close-up of a cheek with inflamed acne. Raised pink-red bumps, a few with yellow-white heads, sit in a patch of redness, and the skin between them is dry and flaking.
Acne
Strong evidence
Brings widespread inflamed acne down quickly, and is meant to be used for three to four months, not indefinitely. Always alongside a topical, which is what carries on once the tablets stop.
Close-up of small pink bumps and flaky skin clustered on the chin below the lower lip
Perioral Dermatitis
Strong evidence
A tetracycline tablet taken for six to twelve weeks, used when the rash is widespread, stubborn or around the eyes. It works here as an anti-inflammatory rather than by killing an infection, so a low dose is often enough. It makes the skin burn more easily in the sun, and it is not used in young children or in pregnancy.
Cellulitis
Cellulitis
Strong evidence
Used when MRSA is a concern, when there is pus or a boil involved, or when penicillins do not suit. It is often paired with a second antibiotic because it covers strep less reliably on its own. It is avoided in pregnancy and in young children, and it makes sunburn more likely.
Hidradenitis Suppurativa
Hidradenitis Suppurativa
Moderate evidence
A tetracycline antibiotic taken for two to three months, used here for its anti-inflammatory effect rather than to kill an infection. That is why the course is months rather than a week. It reduces flares for many people with mild to moderate disease, and it generally stops working once it is stopped. Take it with water and stay upright afterwards, and expect to burn more easily in the sun.
Impetigo
Impetigo
Moderate evidence
Reserved for adults and older children when a swab shows resistant staph, and not used in young children or in pregnancy — ask your doctor if either applies. It is a reasonable option for the age group that fits it, but for the usual patient with impetigo, a small child, it is not the drug.

Not the Best For

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Folliculitis
Limited evidence
A longer course is sometimes used for stubborn or recurring folliculitis, partly for the bacteria and partly because it calms inflammation. It is a second choice rather than a first one, since it can allow yeast folliculitis to take hold. It also causes sunburn easily, so it needs daily sunscreen on anything the sun reaches.
Close-up of light skin with a scattered cluster of small pink raised bumps, some with tiny white tips
Fungal Acne (Malassezia Folliculitis)
Weak evidence
An antibiotic prescribed for acne is one of the most reliable ways to make this worse, because it clears the bacteria that hold the yeast in check. A crop of itchy bumps appearing a few weeks into or after a course is a classic history. It is not a treatment for fungal acne.
Two skin close-ups side by side, labeled Whitehead (Closed Comedone) and Blackhead (Open Comedone)
Blackheads and whiteheads
Doesn't work
Doxycycline calms inflammation and lowers bacteria. Neither of those opens a pore that is already blocked, so clogs are left untouched.
Close-up of a cheek with inflamed acne. Raised pink-red bumps, a few with yellow-white heads, sit in a patch of redness, and the skin between them is dry and flaking.
Acne in the long run
Doesn't work
It is meant for a few months while a topical treatment takes over. If nothing else is in place when it stops, the acne usually comes back.

Forms

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Hyclate or monohydrate
Tablets and capsules
Monohydrate is usually gentler on the stomach.
For stomach upset
Enteric-coated versions
A coating that delays where the drug is released, for people who get stomach upset with the standard version.
Rosacea
Low-dose modified release
Designed to act on inflammation without killing bacteria. Used mainly for rosacea.

Strengths

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The daily dose is built from a few fixed strengths, so you may get more than one tablet.

WeakestStrongest
50 mg100 mg150 mg
The lower strength
50 mg
For a smaller daily total.
The common strength
100 mg
What most prescriptions use.
The higher strength
150 mg
A larger total in one tablet.

Dose

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Dose depends on what your stomach tolerates, not body weight. Kidney or liver problems can lower it.

Starting dose
50 mg to 100 mg once or twice a day. Some doctors start low to see how your stomach does.
Going up
Raised after a week or two if you tolerate it and the acne has not budged.
Usual dose
Around 100 mg once or twice daily. Low-dose anti-inflammatory regimens use much less.
Total course
Three to four months. Reassess at three months and stop once topical treatment can hold the result.

How to Take It

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When to take it: With a full glass of water and with food. Stay upright for 30 minutes afterward, and never right before bed — a tablet stuck in the food pipe can burn the lining. Food cuts the nausea and does not block absorption.

If you miss a dose: Take it when you remember, unless the next dose is close. Never double up — you will just be nauseated.

What to Expect

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Weeks 1 to 2Weeks 2 to 6After 12 weeks
Weeks 1 to 2
Little change. Any stomach upset shows up now.
Weeks 2 to 6
Fewer, less painful inflamed spots. Blackheads do not change.
After 12 weeks
If inflamed acne is no better, continuing will not help. Reassess rather than extend.

Side Effects

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Most people take it without trouble. Stomach upset and sunburn are the two that make people stop.

Common — expected, and they settle

  • Stomach upset Nausea or discomfort, worse on an empty stomach.
  • Sun sensitivity You can burn after much less sun than usual.
  • Yeast infection Some women get one during a course.

Tell your doctor — worth a call, not an emergency

  • Painful swallowing or chest pain Usually means the pill irritated your food pipe.
  • Headache or any change in vision Can signal raised pressure around the brain.
  • A rash after being in the sun Even after a short time outside.

Stop and get care

  • Severe headache with blurred or double vision: Get seen the same day.
  • Watery or bloody diarrhea with fever During the course or in the weeks after it.
  • A spreading rash that blisters Or facial swelling with fever.

What to Avoid

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  • Lying down straight after a dose Stay upright about half an hour, or the capsule can sit in the food pipe and irritate it.
  • Sun and tanning beds You burn faster than you expect. Sunscreen and covering up matter more than usual.
  • Antacids, iron, calcium and dairy Taken together they bind the drug, so less gets in. Space them by about two hours.
  • High-dose vitamin A supplements They add to the risk of raised pressure around the brain.
  • Heavy drinking No direct interaction, but it clears the drug faster, so it may work less well.

Monitoring

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No blood tests are needed for a standard acne course in a healthy person. Monitoring is clinical, with a review at about three months.

This is not a drug to stay on for years. What builds is antibiotic resistance — in your skin bacteria and in the rest of your body — along with effects on the gut. Keep oral courses for acne as short as possible, with a topical retinoid running alongside to take over.

If You Stop

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There is no withdrawal and no taper. If a retinoid and benzoyl peroxide are in place, the result usually holds. If doxycycline was doing the work alone, acne returns within one to two months. That relapse is what the maintenance plan exists to break.

Cost

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Generic doxycycline is cheap, though prices have swung at times. Branded high-dose and modified-release versions cost far more and rarely work better. Monohydrate and hyclate are both generic — if one upsets your stomach, try the other.

Ask Your Doctor

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Isotretinoin, now or planned
Both raise pressure around the brain, so doxycycline stops before isotretinoin starts.
Pregnancy or breastfeeding
Or planning one. Ask before you start or continue.
A child under eight
Tetracyclines permanently stain developing teeth.
An allergy to any tetracycline
Including minocycline and tetracycline itself.

How It Compares

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MinocyclineDiagram: how Minocycline works in the skin
Minocycline
Worse
similar effect, but carries rarer serious risks including blue-gray skin discoloration and drug-induced lupus. Doxycycline is usually preferred.
An amber pill bottle labeled Seysara tipped over with white tablets spilling out16:9 hero for Sarecycline (Seysara). Never cropped: the tone strip and the corner logo depend on the full frame.
Sarecycline
The same
a narrower-spectrum tetracycline made for acne, with less effect on gut bacteria. More expensive.
Trimethoprim or amoxicillin
Different job
alternatives when tetracyclines cannot be used, such as in pregnancy or in young children.
An amber prescription bottle lying on its side on a white background with a plain white label reading Spironolactone, and six small round white tablets spilled out in front of it.Diagram: how Spironolactone works in the skin
Spironolactone
Better
for adult women, often a better long-term choice than repeated antibiotic courses.
Isotretinoin
Different job
for severe or scarring acne, or acne that keeps returning after antibiotics.

Myths

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  • "It stops your birth control working." Only rifampin and rifabutin have been shown to do that. CDC and ACOG do not ask for backup contraception with acne antibiotics.
  • "You cannot eat or have dairy on it." Doxycycline is far less affected by food than older tetracyclines. Calcium, iron and antacids bind some of it, so space those by about two hours. You do not need an empty stomach, and food reduces the nausea.
  • "Antibiotics fix acne for good." They lower inflammation while you take them. That is why doxycycline is paired with a topical treatment that holds the result after the course ends, usually at three to four months.

Questions Patients Ask

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How long will I be on it?

Three to four months. A year on it means the plan needs revisiting, not refilling.

Can I drink alcohol?

Occasional drinking is fine. Heavy drinking can lower drug levels.

Does it stop my birth control working?

No. There is no meaningful interaction with combined oral contraceptives. Rifampin is the one that interferes.

Why do I burn so easily now?

It makes skin much more reactive to ultraviolet light, and reverses after you stop.

Can I take it alongside isotretinoin?

No. That combination raises the risk of pressure around the brain.

References

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