The Hidden Long-Term Side Effects of Common Painkillers Most Doctors Don't Warn You About

Quick Summary 

Most Indians reach for a painkiller the moment pain strikes, but very few are told about the serious risks that come with regular use. This article covers what the science and Indian clinical data actually say about NSAIDs, paracetamol, and opioids, including their documented effects on the gut, heart, kidneys, and liver. It also addresses the specific risks during pregnancy, and covers what safer, drug-free alternatives look like for everyday chronic pain management. If you have been relying on painkillers for weeks or months without medical guidance, this is worth reading before you reach for the next tablet. 

Why Painkillers Are So Normalised in India and What It Is Costing Us 

If you have ever reached for a painkiller the moment your back hurts, your knee aches, or a headache sets in, you are far from alone. In India, a landmark study published in the journal Pain Practice found that 68% of chronic pain patients are treated with over-the-counter (OTC) drugs, and a striking 95% of those patients were specifically taking NSAIDs (Non-Steroidal Anti-Inflammatory Drugs) such as ibuprofen and diclofenac. These numbers reflect just how normalised painkiller use has become in our daily lives. The burden this creates is significant. A study published in the Indian Journal of Palliative Care found that approximately 19.3% of Indian adults translate to an estimated 180 to 200 million people suffering from chronic pain, yet only 4.8% of them ever consult a specialist pain physician. The vast majority manage their pain on their own, most often with over-the-counter NSAIDs. 

But here is the thing: the side effects of painkillers, particularly with regular or long-term use, are often downplayed or simply not discussed. This blog is not about making you afraid of medication. It is about giving you honest, research-backed information so you can make smarter choices for your long-term health.

What Are the Most Common Painkillers People Use?

Most people rely on one of three categories:

• NSAIDs such as ibuprofen, naproxen, aspirin, and diclofenac

• Paracetamol (acetaminophen), often seen as the "safe" option

• Opioids such as codeine or tramadol, typically prescribed for moderate to severe pain

Each of these carries its own risk profile, especially when used over a prolonged period.

The Long-Term Side Effects of Painkillers You Should Know About

1. Gastrointestinal Damage

One of the most well-documented long-term side effects of painkillers, particularly NSAIDs, is damage to the gastrointestinal tract. Research published in Scientific Reports (2024) found that NSAIDs contribute to 30% of hospital admissions for adverse drug reactions, and 13 to 15% of NSAID users experience upper gastrointestinal adverse effects. A quarter of all peptic ulcer cases may result from NSAID use alone.

An Indian multi-centric cross-sectional study that monitored over 2,000 patients found the NSAID-associated point prevalence of gastrointestinal complications was as high as 30.08%. That is nearly one in three patients experiencing gut-related harm from these commonly used drugs.

2. Cardiovascular Risk

NSAIDs have also been associated with a 25% increased risk of cardiovascular events including heart attacks and strokes, according to research in Scientific Reports. Importantly, Harvard Medical School has noted that even opioids are associated with a higher risk for cardiovascular events than previously believed. 

The same Indian multi-centric study found the NSAID-associated point prevalence of cardiac complications to be 42.77%, a figure that underscores how seriously these risks need to be taken. 

3. Kidney Damage

Long-term use of NSAIDs is a well-established cause of kidney damage. Researchers have found that even short-term NSAID use can disturb kidney function, especially in vulnerable individuals. The same Indian study reported an NSAID-associated renal complication prevalence of 27.88%. Conditions ranging from acute kidney injury to chronic kidney disease progression have been linked to regular NSAID use in peer-reviewed research. 

A pharmacovigilance study published in the Indian Journal of Pharmacology, which analysed case reports from the Pharmacovigilance Programme of India, found that approximately 82% of NSAID-induced chronic kidney disease (CKD) cases occurred in patients aged 40 to 80 years with diclofenac, one of the most commonly sold NSAIDs in Indian pharmacies, responsible for 43% of those cases. Around 79% of these cases were classified as serious, with 54% requiring hospitalisation. 

4. Bone and Fall Risk

A meta-analysis of 30 studies published by the Faculty of Pain Medicine found a significant increase in the risk of falls, fractures, and fall injuries among older people who use opioids for chronic pain management. Adults over 65 with hip fractures were found to be more than four times more likely to have been on opioid therapy prior to the fall. For a population already at risk of bone loss, this is a critical concern.

In India, this risk is compounded by the fact that older adults aged 45 and above already carry a high burden of musculoskeletal pain, A 2024 study published in BMC Geriatrics found that 47% of Indians aged 45+ report joint pain, 31% report back pain, and 20% suffer from ankle or foot pain. Adding opioid-related fall risk on top of this pre-existing vulnerability makes long-term opioid reliance a particularly serious concern in the Indian context. 

5. Paracetamol Is Not Risk-Free Either

Many people assume paracetamol is completely safe because it lacks the gastrointestinal effects of NSAIDs. However, research published in Nature Reviews Endocrinology highlights that paracetamol is the leading cause of acute liver failure in overdose or chronic use scenarios. In the Indian context, this is particularly relevant. A study published in the Indian Journal of Gastroenterology found that drug-induced liver injury accounts for approximately 13% of acute liver failure cases in India, with paracetamol and anti-tuberculosis drugs being among the most common culprits. Given that paracetamol is often perceived as completely safe and is widely self-medicated across India, this risk is significantly underappreciated. Like all medications, it must be used at the lowest effective dose for the shortest necessary duration.

Side Effects of Painkillers During Pregnancy

This is an area where awareness is especially important. Between 30% and 80% of women globally use non-prescription painkillers during pregnancy to manage common discomforts and India is no exception, where self-medication during pregnancy is widespread, particularly in semi-urban and rural populations where access to regular prenatal consultations may be limited. 

A landmark study from the University of Aberdeen that analysed data from over 151,000 pregnancies across 30 years found that pregnant women who use over-the-counter analgesics are approximately 1.5 times more likely to have a baby with health issues, including preterm delivery, physical defects, and neonatal complications. 

NSAIDs, in particular, are contraindicated during the third trimester of pregnancy due to the risk of cardiovascular and renal fetotoxicity in the fetus. Research published in PMC  confirms that third-trimester NSAID use is linked to narrowing of the ductus arteriosus and renal impairment in the unborn child. As for paracetamol, the UK Commission on Human Medicines recommends it only at the lowest dose and for the shortest duration, while ongoing research continues to evaluate potential long-term impacts. 

If you are pregnant and dealing with pain, always consult your doctor before taking any medication, even those available over the counter.

What Can You Do Instead? Pain Relief Without Medication

These risks do not mean painkillers are unsafe for everyone or should be avoided entirely. Many medications are highly effective when used appropriately under medical guidance. The goal is understanding where supportive approaches may also fit into a broader pain management plan. There is a growing and well-supported body of research around pain relief without medication, and non-pharmacological approaches are increasingly being recommended by pain specialists globally.

Transcutaneous Electrical Nerve Stimulation (TENS) is one of the most studied drug-free approaches for chronic pain management. A comprehensive appraisal published in PMC that reviewed 169 systematic reviews and 49 meta-analyses found no examples where sufficient data demonstrated that TENS has no benefit, leading its authors to recommend that TENS should be considered as a treatment option. Unlike painkillers, no serious adverse effects have been reported with TENS therapy.

TENS devices designed for home use may offer a supportive option for managing some types of chronic pain. For those dealing primarily with nerve-related discomfort, a targeted nerve pain relief device that combines both TENS and EMS in one unit can be a practical starting point. Those managing knee-specific pain alongside general muscle discomfort may benefit from exploring a dedicated knee therapy device, while people looking to address muscle fatigue and recovery may find a home EMS device a useful addition to their pain management routine."  

Other approaches worth exploring alongside TENS include physiotherapy and guided exercise, heat and cold therapy, yoga and gentle stretching, and acupressure. The goal of a well-rounded chronic pain management plan is to reduce dependence on daily medication while still living comfortably and actively.

A Note on Responsible Pain Management

This blog is not an argument against all painkillers. There are absolutely situations where medication is necessary, appropriate, and lifesaving. The point is that long-term painkiller use should always be supervised by a qualified healthcare professional, doses should be as low and durations as short as possible, and non-pharmacological alternatives should be explored early, not as a last resort.

If you have been relying on painkillers for more than a few weeks, it is worth speaking with your doctor about a broader pain management plan that considers all your options.

Frequently Asked Questions

Q1. What are the most common long-term side effects of painkillers like ibuprofen?

The most common long-term side effects of NSAIDs like ibuprofen include gastrointestinal issues such as ulcers and bleeding, increased cardiovascular risk including a higher chance of heart attacks and strokes, and kidney damage that can range from acute kidney injury to progression of chronic kidney disease. A multi-centric Indian study found that among NSAID users, the prevalence of gastrointestinal complications was 30.08%, cardiac complications 42.77%, and renal complications 27.88%. These numbers highlight that the risks are not rare or negligible, particularly with prolonged use without medical supervision.

Q2. Is paracetamol truly safe for long-term use?

Paracetamol is widely considered the safer alternative to NSAIDs because it does not cause the same gastrointestinal irritation. However, it is not without risk. At high doses or with chronic use, paracetamol is the leading cause of acute liver failure in adults and children in the Western world. UK regulatory authorities advise using it at the lowest effective dose for the shortest possible time. It is safer than NSAIDs in terms of gut and cardiovascular risk, but it is not a risk-free option when overused.

Q3. What are the specific side effects of painkillers during pregnancy?

During pregnancy, both NSAIDs and paracetamol require particular caution. A large study spanning over 151,000 pregnancies found that women using OTC analgesics during pregnancy were about 1.5 times more likely to have a baby with adverse health outcomes. NSAIDs are contraindicated in the third trimester because of the risk of cardiovascular and renal problems in the fetus. Paracetamol is still considered the analgesic of first choice during pregnancy but only at the lowest dose and for the shortest time necessary. Pregnant women should always consult a doctor before taking any painkiller, including seemingly safe OTC options.

Q4. Are there effective drug-free options for chronic pain management?

Yes, and the research on this is growing significantly. TENS therapy is one of the most widely studied non-pharmacological options for chronic pain management. A comprehensive review of 169 systematic reviews and 49 meta-analyses found that no analysis with sufficient data demonstrated TENS to be ineffective, and no serious adverse effects from TENS have been reported in clinical literature. Other approaches such as physiotherapy, targeted exercise, heat and cold therapy, acupressure, and yoga have all demonstrated varying degrees of evidence-backed benefit. The key is building a personalised, multi-modal pain management plan rather than relying solely on daily medication.

Q5. When should I be worried about my painkiller use and speak to a doctor?

You should speak to a doctor if you are using painkillers daily or near-daily for more than two weeks, if you are relying on increasing doses to get the same effect, if you are experiencing side effects such as stomach pain, heartburn, swelling, or changes in urination frequency, or if you are pregnant or planning to become pregnant. Long-term self-medication with OTC analgesics is a common pattern that can quietly cause organ damage over time. A doctor or pain specialist can help you evaluate whether your current approach is sustainable and what alternatives might work better for your specific type of pain.