The most effective medicines for chills are acetaminophen (Tylenol) and ibuprofen (Advil, Motrin), both available over the counter. Since chills are usually the body’s response to a rising fever, these fever-reducing medicines address the root cause, and the shivering typically stops once your temperature comes back down.
Why Chills Happen
Chills are caused by rapid cycles of muscle contraction and relaxation. Your body produces heat this way when it senses a gap between your current temperature and a new, higher “set point” triggered by infection or illness. That’s why chills often come just before a fever spikes. Once your temperature reaches that set point, the shivering stops on its own.
This means treating chills is really about treating the fever behind them. Fever-reducing medicines lower that internal set point, which eliminates the signal telling your muscles to generate extra heat.
Acetaminophen (Tylenol)
Acetaminophen is the go-to option for most people. Adults can take 500 to 1,000 mg every four to six hours as needed. The critical safety limit is no more than 4,000 mg in a 24-hour period, because higher doses risk liver damage. If you have any liver condition, that ceiling drops significantly, often to 2,000 mg per day or less. Be careful to check the labels on any other medicines you’re taking (cold and flu combinations, sleep aids, sinus products), since many of them already contain acetaminophen and the totals add up fast.
Acetaminophen reduces fever effectively but does not reduce inflammation. It’s a good first choice if you have a sensitive stomach or can’t take anti-inflammatory drugs.
Ibuprofen and Naproxen (NSAIDs)
Ibuprofen and naproxen are nonsteroidal anti-inflammatory drugs. They reduce fever and also fight inflammation, which can make them a better fit when chills come alongside body aches, sore throat, or joint pain from the flu or a cold.
Ibuprofen is typically taken every four to six hours. Naproxen lasts longer, so it’s taken every 8 to 12 hours, which can be more convenient if you’re trying to sleep through the night without waking up to re-dose. Both should be taken with food to reduce the chance of stomach irritation.
You can alternate between acetaminophen and ibuprofen if one alone isn’t keeping your fever down, since they work through different pathways. For example, take acetaminophen, then three hours later take ibuprofen, and continue rotating. This approach keeps a steady level of fever reduction without exceeding the safe limits of either drug.
Aspirin: Not for Everyone
Aspirin also reduces fever and is fine for most adults. However, it should never be given to children or teenagers who have a viral illness like the flu or chickenpox. Aspirin use in young people with these infections is linked to Reye’s syndrome, a rare but serious condition that causes swelling in the liver and brain. Stick with acetaminophen or ibuprofen for anyone under 18.
Medicine for Children With Chills
Children’s doses are based on weight, not age. Acetaminophen can be given to infants six months and older (check with a healthcare provider before giving any medicine to a baby younger than six months). Ibuprofen is approved starting at six months of age and is dosed every six to eight hours.
Children’s versions come in liquid suspensions and chewable tablets with concentrations clearly marked on the label. A 24-pound child, for example, gets 160 mg of acetaminophen per dose, while a 50-pound child gets about 320 mg. For ibuprofen, a child weighing 22 to 32 pounds gets 100 mg, and a child over 66 pounds gets 300 mg. Always use the measuring device that comes with the product rather than a kitchen spoon.
When Chills Happen Without a Fever
Not all chills are fever-related. Low blood sugar in people with diabetes, menopause-related hot flashes, panic attacks, hangovers, and even drug withdrawal can all cause shivering without any temperature increase. In these cases, a fever reducer won’t help much because there’s no elevated set point to bring down. The chills resolve when the underlying trigger is addressed, whether that means eating something to raise blood sugar, managing anxiety, or treating an infection with antibiotics.
Bacterial infections like pneumonia, urinary tract infections, and sepsis can also cause chills. These require prescription treatment, and over-the-counter fever reducers only manage the symptom while the real problem needs targeted therapy.
What Else Helps Besides Medicine
Fluids matter more than most people realize. Fever increases how quickly your body loses water, and dehydration makes you feel worse. Water, clear broth, and warm liquids like tea or warm lemon water with honey all help. Avoid alcohol and caffeinated drinks, which pull fluid out of your body faster.
Layer up with blankets if you’re shivering, but don’t overdo it once the fever breaks and you start sweating. Rest is genuinely therapeutic here. Your immune system works more efficiently when your body isn’t spending energy on other tasks. A cool-mist humidifier can also help if your chills are paired with congestion from a cold or flu.
Signs That Need Immediate Attention
Most chills pass within a day or two as your body fights off an infection. But certain symptoms alongside chills signal something more serious. In adults, difficulty breathing, persistent chest or abdominal pain, confusion, seizures, severe weakness, or not urinating are all reasons to seek emergency care. A fever that improves and then returns, or gets worse, also warrants prompt medical evaluation.
In children, watch for fast or labored breathing, bluish lips or face, ribs pulling in with each breath, refusal to walk due to muscle pain, no urine for eight hours, or a fever above 104°F that doesn’t respond to medicine. Any fever in a baby under 12 weeks old needs immediate medical attention regardless of other symptoms.