Along with its needing effects, a drug may cause some unwanted effects. In some infants and children, tetracyclines may cause the teeth to become discolored. Even though this may not happen right away, check with your family doctor as soon as possible if you notice this effect or if you have any questions about it.
For all tetracyclines
More common
Increased sensitivity of skin to sunlight - rare with minocycline
Rare
Abdominal pain; bulging fontanel - soft spot on head of infants; headache; loss of appetite; nausea and vomiting; visual changes; yellowing skin
For demeclocycline only
Less common
Greatly increased frequency of urination or amount of urine; increased thirst; unusual tiredness or weakness
For minocycline only
Less common
Pigmentation - darker color or discoloration of skin and mucous membranes
More common side effects may occur that usually do not need medical attention. These side effects may go away during treat as your body adjusts to the drug. However, check with your family doctor if any of the following side effects continue or are bothersome:
For all tetracyclines
More common
Cramps or burning of the stomach; diarrhea
Less common
Itching of the rectal or genital - sex organ areas; sore mouth or tongue
For minocycline only
More common
Dizziness, light-headedness, or unsteadiness
In some diseaseds tetracyclines may cause the tongue to become darkened or discolored. This effect is only temporary and will go away when you stop taking this drug.
More common side effects not listed above may also occur in some diseaseds. If you have any other problems, check with your family doctor.