A nurse is caring for a client recently prescribed doxycycline (Doryx) for the treatment of a urinary tract infection. Which of the following statements below applies to doxycycline (Doryx)? (Select All that Apply.)

A) This medication may cause discoloration of the teeth: Doxycycline is a tetracycline-class antibiotic, and like other drugs in this group, it can bind to calcium in developing teeth, leading to permanent discoloration if taken during childhood or by pregnant or breastfeeding women whose fetuses or infants are exposed to the drug. In adults, it can still cause temporary staining, especially with prolonged use. Patients should be informed about this potential side effect to prevent concern and encourage good oral hygiene. B) This medication should not be taken if you are lactating: Doxycycline is generally considered compatible with breastfeeding, although it should be used with caution. While doxycycline does pass into breast milk, the risk to an infant is minimal, particularly for short-term use. However, the safety profile may vary depending on the infant's age and health, and a healthcare provider should evaluate the risks and benefits in each case. C) This medication should not be taken with antacids: Antacids containing calcium, magnesium, or aluminum can interfere with the absorption of doxycycline. These minerals bind to the antibiotic in the gastrointestinal tract, decreasing its effectiveness. It is recommended to space the administration of doxycycline and antacids by at least 2 hours to ensure adequate absorption of the medication. This is a key consideration in managing patients taking doxycycline. D) This medication can cause hyperglycemia: Doxycycline is not typically associated with hyperglycemia. Hyperglycemia is not a common or expected side effect of this medication. Doxycycline's side effects more commonly involve gastrointestinal distress, photosensitivity, and potential effects on the liver or kidneys. Hyperglycemia would be more likely in a diabetic patient on steroids or other specific medications, not generally with doxycycline. E) This medication should not be administered to anyone under the age of 20 years old: Doxycycline is contraindicated in children under 8 years old due to the risk of tooth discoloration and impaired bone development, not generally in those under 20 years of age. While it may be used with caution in adolescents for specific infections, the drug is not recommended for younger children. However, there is no blanket restriction for those under 20, especially if the benefits outweigh the risks. F) This medication may cause photosensitivity: Doxycycline can increase the skin’s sensitivity to sunlight, resulting in an increased risk of sunburn or skin rash. This is a well-known side effect of tetracycline antibiotics, and patients taking doxycycline should be advised to avoid prolonged sun exposure, wear sunscreen, and protective clothing to reduce the risk of photosensitivity reactions.