Doxycycline vs Minocycline

Dose is set by what you tolerate more than body weight. Dizziness is the usual limit, not the stomach. Liver problems can lower it.

Starting dose: Commonly 50 mg to 100 mg once or twice a day. Some doctors start low for a week to see how you feel.

Going up: After a week or two if it is tolerated and acne has not begun to respond.

Usual dose: Around 100 mg once or twice daily. The extended-release form is about 1 mg per kilogram of body weight, once daily.

Total course: About three to four months. Guidelines advise reassessing at three months and stopping once the topical can hold the result. Long uninterrupted use is what raises the pigment risk.

With a full glass of water. Food is fine and usually reduces nausea. Stay upright for at least 30 minutes afterwards, and not right before bed — a tablet that lodges in the food pipe can burn the lining.

If it makes you unsteady, taking it at night helps, since you sleep through the peak. Ask your doctor before changing the timing.

Space antacids, iron and calcium supplements by about two hours. They bind the drug and less gets in.

Take it when you remember, unless the next dose is close. Never take two at once — a doubled dose mostly produces nausea and dizziness.

No routine blood tests for a standard three to four month course in a healthy person. Monitoring is clinical: a review at about three months, and a look at skin, gums and old scars for a gray or blue tinge.

Blood tests are ordered if something appears. Joint pain, fever or unusual tiredness prompts testing for a lupus-like reaction; a rash with fever and swollen glands, for a hypersensitivity reaction that can involve the liver. Both are rare, likelier with long use, and usually settle once the drug stops.

This is not a drug to stay on for years. Two things build up: antibiotic resistance, and pigment that is dose and duration related and can be slow to fade or permanent. Guidelines say oral antibiotic courses for acne should be as short as possible, with a topical retinoid alongside to take over.

Weeks 1 to 2Settling in: Little change in the skin yet.

Weeks 2 to 6Working: Red, sore papules and pustules become fewer and less painful. This is what minocycline is aimed at.

First doseTaking it: One tablet with plenty of water, sitting upright. Nausea or dizziness show up in the first few days if they happen.

Weeks 8 to 12Judge it here: Most of what an antibiotic will give has arrived. Dark marks fade as fewer new spots form, over months, faster with sun protection.

Generic immediate-release minocycline is inexpensive and widely stocked, usually in the same price range as generic doxycycline, and both are covered by most plans.

The extended-release brands cost far more, and prior authorization is common. You would be paying for comfort rather than clearing: the slower release was meant to reduce dizziness, not clear acne better.

If cost is the problem, say so before you leave. Doxycycline, minocycline and plain tetracycline are all generic, so the choice can follow what your plan covers.