Lithium Prescription: What You Need to Know

If you or a loved one has been diagnosed with bipolar disorder, chances are a doctor mentioned lithium. It’s one of the oldest mood‑stabilising drugs and still a first‑line choice for many. But getting a prescription, taking the right dose, and staying safe can feel confusing. This guide breaks down the basics so you can feel confident about your treatment.

Getting a Lithium Prescription

First step: talk to a GP or psychiatrist. In the UK, you’ll usually start with your GP, who may refer you to a mental‑health specialist. The doctor will ask about your mood swings, medical history and any other medications you’re on. Lithium isn’t a one‑size‑fits‑all drug, so they’ll start you on a low dose – often 300 mg once a day – and adjust based on blood tests.

Blood testing is a must. Lithium works inside your cells, and the therapeutic window is narrow: too low and it won’t help, too high and you risk toxicity. Expect a blood draw 5‑7 days after the first dose, then every few weeks until your level settles in the 0.6‑0.8 mmol/L range. Your doctor will use those numbers to tweak the dose.

Prescriptions in the UK are usually for 28 days. If you’re stable, you can get a repeat prescription from your GP, but they’ll still want a recent blood result. Keep a record of your appointment dates and test results – it makes the refill process smoother.

Managing Your Lithium Treatment

Take lithium exactly as prescribed. Most people take it once or twice a day with food to avoid stomach upset. Consistency matters: take it at the same times each day and don’t skip doses.

Stay hydrated. Lithium is salt‑based, so low fluid intake can raise its level in the blood. Aim for at least 1.5–2 litres of water a day, especially if you’re exercising or it’s hot outside.

Watch for side effects. Common ones include mild tremor, increased thirst, and a bit of weight gain. If you notice nausea, severe tremor, blurry vision or irregular heartbeat, call your doctor right away – these could signal high lithium levels.

Other meds can interact with lithium. NSAIDs (like ibuprofen), diuretics and some antibiotics can raise lithium levels, while calcium supplements may lower them. Always tell your prescriber about over‑the‑counter drugs or supplements you’re taking.

Pregnancy and breastfeeding require special attention. Lithium can cross the placenta and may affect a newborn’s heart rhythm. If you’re planning a family, discuss alternatives or close monitoring with your psychiatrist.

Regular check‑ups are key. Besides blood tests, your doctor will track kidney and thyroid function because lithium can impact both over time. If any lab result looks off, they may adjust the dose or recommend a break.

Finally, don’t feel alone. Many people on lithium join support groups or online forums where they share tips on staying balanced, handling side effects and dealing with paperwork. Peer advice can be a great supplement to professional care.

Getting a lithium prescription and staying on it doesn’t have to be a mystery. Talk openly with your doctor, keep up with blood tests, stay hydrated, and watch for side effects. With the right plan, lithium can be a powerful tool in managing mood swings and helping you live a steadier life.