The literature states: Doxycycline is a broad-spectrum antibiotic of the tetracycline class. Do not take iron supplements, multivitamins, calcium supplements, antacids, or laxatives within 2 hours before or after taking this medicine. Avoid exposure to sunlight or tanning beds. Doxycycline can make birth control pills less effective. Other drugs may interact with doxycycline, including prescription and over-the-counter medicines, vitamins, and herbal products. Read the literature regarding other possible side effects.
.......Also, be aware about antibiotics in general (take probiotics at specified intervals to replenish). According to one BBC article: ""The gut microbiome is a complex network of microbiotic lifeforms and all the things they need to sustain themselves in the niche of the body," says James Kinross, a consultant colorectal surgeon at Imperial College London.

The gut microbiome plays a huge role in maintaining our health, including regulating the immune system and aiding digestion. And experts argue that antibiotics are one of the biggest threats to our gut microbiomes.

Antibiotics, commonly prescribed to treat and prevent bacterial infections, are a cornerstone of modern medicine. But in the process of targeting the infection-causing bacteria in our bodies, antibiotics can also inadvertently wipe out the other bacteria in our bodies."