Amlodipine is taken once a day, with or without food, at the same time each day. That consistency matters more than the specific hour you choose. The medication works by relaxing blood vessels, which lowers blood pressure and reduces strain on the heart. Here’s what you need to know to take it correctly and get the most from it.
Timing and Food
You can take amlodipine in the morning or at night. Food doesn’t affect how your body absorbs it, so you can take it with a meal or on an empty stomach. The key is picking a time that’s easy to remember and sticking with it. Many people pair it with a daily habit like brushing their teeth or eating breakfast.
After you swallow a tablet, blood levels of the drug peak between 6 and 12 hours later. But amlodipine is a slow-building medication. It takes 7 to 8 days of daily dosing before the drug reaches a steady level in your system, which is when you’ll see its full blood pressure effect. Don’t be discouraged if your numbers don’t drop immediately.
Typical Doses
Most people start at 5 mg once daily for high blood pressure. The maximum is 10 mg per day. For chest pain related to angina, the dose range is also 5 to 10 mg, with most people eventually needing 10 mg for adequate relief.
Older adults and people with liver problems typically start lower, at 2.5 mg once daily. The body clears amlodipine through the liver, and in people with liver impairment the drug stays active roughly twice as long. That means the dose builds up more, and increases need to happen slowly.
What to Do if You Miss a Dose
If you realize you missed a dose and it’s still well before your next one, take it as soon as you remember. If it’s close to the time for your next dose, skip the missed one and return to your regular schedule. Never double up to make up for a missed tablet.
Grapefruit and Drug Interactions
Large amounts of grapefruit or grapefruit juice can raise amlodipine levels in your body and intensify side effects like dizziness, flushing, or headaches. A small amount is unlikely to cause problems for most people, but if you notice increased side effects after eating grapefruit, it’s worth cutting it out.
If you take a cholesterol-lowering statin, the combination matters. Amlodipine increases the amount of certain statins your body absorbs. In studies, taking 10 mg of amlodipine alongside 80 mg of simvastatin raised simvastatin exposure by 77%. Because of this, the recommended maximum dose of simvastatin or lovastatin while on amlodipine is 20 mg daily. If you’re on both medications, your prescriber should already be aware, but it’s worth double-checking.
Common Side Effects
The most frequently reported side effect is swelling in the ankles or feet, called peripheral edema. This happens because amlodipine widens the small arteries more than the veins, which allows fluid to pool in the lower legs. It’s not dangerous, but it can be uncomfortable. The swelling tends to be more common at the 10 mg dose than at 5 mg.
Other common side effects include flushing, fatigue, dizziness, and headache. These often improve after the first week or two as your body adjusts to lower blood pressure. If dizziness is significant, taking your dose at bedtime can help, since you’ll sleep through the peak effect.
How to Store It
Keep amlodipine at room temperature, between 59°F and 86°F. Store it in a dry place away from light, which means the bathroom medicine cabinet is not ideal despite being the most common spot people choose. A bedroom dresser drawer or kitchen cabinet away from the stove works well. Keep it in its original container to protect it from moisture.
Why Consistency Matters
Amlodipine has an unusually long half-life compared to most blood pressure medications. It stays active in your body for a long time, which is part of why it works well as a once-daily drug. But that long action also means the drug accumulates gradually over the first week. If you take it sporadically, you never reach a steady protective level. And if you suddenly stop, your blood pressure won’t spike overnight the way it might with shorter-acting drugs, but it will climb back up over several days. Treat it as a daily habit, not something you take only when you feel your blood pressure is high.