Final answer:
Clients should be cautioned about the potential side effects of tetracycline, including phototoxicity, discoloration of developing teeth, and liver toxicity.
Step-by-step explanation:
When taking tetracycline, clients should be cautioned about the potential side effects. Tetracycline can cause phototoxicity, which means that it can make the skin more sensitive to sunlight and increase the risk of sunburn and skin damage. It can also lead to permanent discoloration of developing teeth, so it is not recommended for use in young children and pregnant women. Additionally, high doses of tetracycline or use in patients with kidney impairment can cause liver toxicity.