Final answer:
Ibuprofen, an NSAID, can drastically increase blood lithium levels, leading to a risk of lithium toxicity. Patients on lithium should consult their healthcare provider before using ibuprofen.
Step-by-step explanation:
The medication that can drastically increase lithium levels from the options provided is Ibuprofen. Nonsteroidal anti-inflammatory drugs (NSAIDs), like ibuprofen, can lead to increased levels of lithium in the blood by reducing the kidney's ability to clear lithium. This can lead to a greater risk of lithium toxicity, which is a serious condition. It is crucial for individuals taking lithium to consult their healthcare provider before taking NSAIDs like ibuprofen. Other options listed like citalopram, carbamazepine, sertraline, and acetaminophen do not have the same impact on lithium levels as ibuprofen.