This article is education, not medical advice. Nothing here is a reason to stop, start, or change any prescribed medication. Every section includes guidance on what to discuss with your GP or prescribing clinician — that conversation is the action, not self-adjusting your prescription. If you are experiencing side effects from any medication, your doctor is the person who can assess whether an alternative is appropriate. This article exists to help you ask better questions, not to replace the person who answers them.
Why This Matters for Masters Cyclists
If you are between 35 and 55, ride seriously, and train with structure, there is a reasonable chance you are also on at least one daily medication. The numbers bear this out. In the UK, roughly 50 per cent of adults over 40 take at least one prescription medication regularly. Statins alone account for around eight million prescriptions per year in England.
Most of those prescriptions are written against the backdrop of a sedentary patient. The clinical trials were run on people who do not ride four days a week, do not care about their FTP, and do not notice a 3 per cent change in recovery quality. The side-effect profiles listed in the patient information leaflet are calibrated to someone whose most strenuous weekly activity is walking to the shops.
You are not that person. Your body operates under different stresses, different metabolic loads, and different recovery demands. That does not mean your medication is wrong. It means the conversation about side effects should be different — and most of the time, it is not happening at all.
This is the gap. Not whether you should be on your medication. Whether you and your doctor have discussed how that medication interacts with 8-12 hours per week of structured endurance exercise. For most riders, that discussion has never taken place.
Statins: The Muscle Pain You Cannot Train Through
Statins — atorvastatin, simvastatin, rosuvastatin — are the most widely prescribed medication class for adults over 40. They lower LDL cholesterol effectively and the cardiovascular mortality data supports their use. That is not in question.
What is relevant for cyclists is the well-documented side effect of statin-related myalgia: muscle pain, aching, and weakness that occurs in roughly 10-15 per cent of patients and appears to be more common in physically active people. Dr Paul Thompson, a cardiologist at Hartford Hospital who has published extensively on statins and exercise, has noted that exercising individuals may be more susceptible to statin-related muscle symptoms because they are placing higher demands on the same muscle fibres affected by the drug.
The problem for cyclists is not just the pain itself. It is that statin-related myalgia mimics training soreness. Your quads ache. Your recovery feels slow. You assume it is DOMS, or accumulated fatigue, or age catching up. You rest more, train less, and nothing changes — because the source is pharmacological, not physiological.
Statins also reduce the body's synthesis of coenzyme Q10, a molecule involved in mitochondrial energy production. The clinical significance of this in exercising individuals is still debated, but research from Marcoff and Thompson has shown measurable reductions in plasma CoQ10 levels in statin users, and some sports medicine physicians recommend supplementation as a precaution.
What to discuss with your GP: If you have persistent muscle aching that does not respond to rest, does not correlate with training load, and feels different from normal post-ride soreness, raise the possibility of statin-related myalgia. The solutions are usually practical. Simvastatin tends to cause more muscle symptoms than rosuvastatin or pravastatin — a switch can resolve the issue entirely. Dose timing matters too. Evening dosing is standard but some patients tolerate morning dosing better when training in the afternoon. CoQ10 supplementation (100-200mg daily) is low-risk and worth discussing. None of these decisions are yours to make alone, but they are yours to raise.
Beta Blockers: Your Heart Rate Zones Are Wrong
Beta blockers — atenolol, bisoprolol, propranolol — are prescribed for hypertension, anxiety, cardiac arrhythmias, and a range of other conditions. They work by blocking beta-adrenergic receptors, which reduces heart rate and cardiac output.
For a cyclist, the practical consequence is blunt: beta blockers cap your heart rate response to exercise. If your resting heart rate drops by 15 bpm and your maximum achievable heart rate drops by 20-30 bpm, every heart rate zone you have ever calculated is wrong. Not slightly off. Fundamentally inaccurate.
This matters because many masters cyclists train by heart rate. If you are on bisoprolol and your Garmin says you are in Zone 2 at 118 bpm, you may actually be working at threshold effort. The perceived exertion does not match the number on the screen. Riders who do not understand this relationship either under-train (because they cannot reach what they think is their threshold heart rate) or over-train (because they push harder trying to hit numbers that are pharmacologically impossible).
Beta blockers also affect thermoregulation. The blunted cardiovascular response means your body is less efficient at redirecting blood flow to the skin for cooling. Hot-weather rides hit harder. Sweat rate may change. The combination of a capped heart rate and impaired heat dissipation means summer performance can drop substantially.
What to discuss with your GP: If you are active and on a beta blocker for blood pressure, ask whether an alternative antihypertensive — an ACE inhibitor or an ARB — might be appropriate. Dr John Mandrola, a cardiologist and competitive cyclist, has written about the preference for ACE inhibitors or ARBs in active patients precisely because they do not blunt the exercise heart rate response. This is not a fringe position. It is standard sports cardiology. Your cardiologist may have specific reasons for choosing a beta blocker (arrhythmia management, for instance, where the heart rate control is the point), but if the primary indication is blood pressure alone, there are alternatives worth discussing. In the meantime, train by power or RPE, not heart rate. A perceived exertion of 6-7 out of 10 gets you into tempo. 8-9 out of 10 gets you to threshold. The numbers on your chest strap are not telling you the truth.
ACE Inhibitors and ARBs: The Exercise-Friendly Option
ACE inhibitors (ramipril, lisinopril, enalapril) and angiotensin receptor blockers (losartan, candesartan, valsartan) are the blood pressure medications that sit most comfortably alongside serious training. They lower blood pressure without suppressing the heart rate response, which means your training zones remain valid and your body can still mount a normal cardiovascular response to hard efforts.
That does not mean they are side-effect free on the bike.
First-dose hypotension is a known issue. When you start an ACE inhibitor or have your dose increased, blood pressure can drop more than expected, particularly during the first few days. On a bike, this can present as light-headedness when you stand out of the saddle, or a head rush when you get off the bike and stand up quickly after a long seated effort. It typically settles within a week.
ACE inhibitors can cause a persistent dry cough — a class effect caused by the accumulation of bradykinin. It affects roughly 5-10 per cent of users. On the bike, a cough during hard efforts can be disruptive and is sometimes misattributed to exercise-induced bronchoconstriction. If you developed a cough after starting an ACE inhibitor, mention it. An ARB provides similar blood pressure control without the cough mechanism.
The more practical concern is hydration. ACE inhibitors and ARBs lower blood pressure in part by affecting fluid balance. On a three-hour ride in warm conditions, the combination of pharmacological blood pressure reduction and exercise-induced dehydration can cause a significant drop in blood pressure. The result: dizziness, fatigue that seems disproportionate to the effort, and in some cases near-syncope. The fix is not complicated — drink more, carry electrolytes, do not skip bottles on hot days — but the connection between the medication and the amplified dehydration effect is rarely explained at the point of prescription.
What to discuss with your GP: If you are starting an ACE inhibitor or ARB, mention your training. Ask about timing the dose relative to exercise, and flag any light-headedness during rides. If you develop a cough on an ACE inhibitor, ask about switching to an ARB. Monitor your hydration more carefully than you would without the medication, particularly in warmer months.
Proton Pump Inhibitors: The Silent Nutrient Drain
PPIs — omeprazole, lansoprazole, esomeprazole — are prescribed for gastro-oesophageal reflux, stomach ulcers, and general acid management. They are also one of the most over-prescribed medication classes in the UK. Many people start a PPI for a specific episode of reflux and remain on it for years without review.
The short-term side-effect profile is mild, which is why PPIs tend to persist on repeat prescriptions without scrutiny. The long-term picture is different. PPIs reduce stomach acid production, which impairs the absorption of several nutrients that matter directly for cycling performance.
Iron. Stomach acid is required for the absorption of non-haem iron. Long-term PPI use has been associated with reduced iron stores. For a cyclist, iron deficiency means reduced haemoglobin, reduced oxygen-carrying capacity, and a decline in endurance performance that can be subtle enough to attribute to overtraining or age. Magnesium. PPIs can cause hypomagnesaemia with long-term use. Low magnesium affects muscle contraction, cramping risk, and sleep quality — three things every masters cyclist is already managing. Calcium and Vitamin B12. Both require adequate stomach acid for absorption. Long-term deficiency in calcium contributes to reduced bone density (already a concern for cyclists, given the non-weight-bearing nature of the sport), and B12 deficiency causes fatigue, neurological symptoms, and impaired red blood cell production.
None of this means PPIs are bad. For the right indication — active ulcer disease, Barrett's oesophagus, severe reflux — they are important medications. The issue is the indefinite repeat prescription that has not been reviewed in three years.
What to discuss with your GP: If you have been on a PPI for more than 12 months, ask for a review. Request blood work to check ferritin, B12, magnesium, and calcium levels. Ask whether a step-down trial is appropriate — reducing the dose gradually to see if symptoms return. Many long-term PPI users can transition to on-demand use or lower doses. Some can stop entirely with dietary and lifestyle modifications. Your GP can guide this. Do not stop abruptly, as rebound acid hypersecretion can make reflux temporarily worse.
SSRIs and SNRIs: Training on Antidepressants
Selective serotonin reuptake inhibitors (sertraline, fluoxetine, citalopram) and serotonin-norepinephrine reuptake inhibitors (venlafaxine, duloxetine) are prescribed for depression, anxiety, OCD, and a range of related conditions. They are important medications, and the framing here is not whether you should be on one. It is understanding how these drugs interact with hard exercise so you can manage the effects.
Three interactions matter for cyclists.
Thermoregulation. SSRIs and SNRIs can alter the body's temperature regulation, increasing sweat rate and reducing heat tolerance during exercise. The serotonergic system is involved in central thermoregulation, and altering it pharmacologically can shift the set point. If you notice that your performance drops disproportionately in warm weather, or that you are drenching jerseys in conditions that previously felt manageable, this is a known pharmacological effect. Not a fitness decline. Not ageing. A medication interaction.
Weight changes. Some SSRIs — paroxetine in particular — are associated with weight gain over time. Others, like sertraline and fluoxetine, tend to be weight-neutral or cause initial weight loss. For a cyclist tracking power-to-weight, unexplained weight change that started around the same time as a new prescription is worth noting.
Supplement interactions. This is the one that can bite. Serotonin syndrome — a potentially serious condition caused by excessive serotonergic activity — can occur when SSRIs are combined with certain supplements. St John's Wort is the most well-known, but 5-HTP and high-dose tryptophan also carry risk. If you are on an SSRI and considering any supplement that claims to support mood or sleep via serotonin pathways, check with your pharmacist or GP first.
What to discuss with your GP: If you are experiencing heat intolerance on rides, mention it in the context of your antidepressant. Adjusting hydration strategy and pacing for warm conditions can mitigate the issue. If you have experienced weight changes since starting an SSRI, discuss whether a switch to a different agent within the same class might be appropriate. And always — always — disclose every supplement you take. The interaction risk is real, and the easiest way to manage it is full transparency with the person managing your prescription.
The Roadman community on Skool has a dedicated thread on training through various medications — if you want to hear from other riders managing these same issues, that is where the conversation is happening.
NSAIDs: The Recovery Habit That Makes You Slower
Ibuprofen. Naproxen. The cyclist's default response to post-ride aching. Pop two after a hard session, take the edge off, get on with the evening.
This habit is actively counterproductive, and the evidence against chronic NSAID use in endurance athletes is substantial.
Dr Keith Baar, a muscle physiologist at UC Davis, has been clear on this point: NSAIDs inhibit cyclooxygenase (COX) enzymes, which suppresses the inflammatory response to exercise. That inflammation is not the enemy. It is the signalling cascade that drives muscle protein synthesis and tissue remodelling. When you suppress it routinely, you blunt the adaptation you just trained to produce. You did the work. Then you chemically undermined the result.
The gut is the second problem. NSAIDs damage the gastrointestinal lining, and this damage is amplified during exercise. Blood flow is diverted away from the gut during hard riding. Combine reduced gut blood flow with NSAID-induced mucosal damage and you get increased intestinal permeability — the mechanism behind many mid-ride GI crises. Dr Ricardo Costa's research on exercise-induced gut damage has shown that NSAID use before or during exercise significantly worsens intestinal barrier function.
The kidneys are the third. During dehydrated exercise, renal blood flow is already reduced. NSAIDs further constrict the renal vasculature. The combination — dehydration, exercise, and NSAIDs — creates genuine risk for acute kidney injury. This is not theoretical. Emergency departments see it, particularly after endurance events where riders take ibuprofen during or immediately after racing.
The occasional anti-inflammatory for a genuine acute injury — a crash, a sprain, an acute inflammatory episode — is appropriate and expected. The pattern of reaching for ibuprofen after every Tuesday evening chain gang is not.
What to discuss with your GP: If you are relying on NSAIDs regularly to manage exercise-related pain, that pain needs investigation, not suppression. Ask about the specific source. Is it musculoskeletal? Is it joint-related? Is it a bike fit issue? A physiotherapist can often identify the mechanical cause that ibuprofen is masking. And if you need occasional pain management, paracetamol does not carry the same anti-inflammatory suppression risks for training adaptation — though it has its own contraindications and should still be used judiciously.
Metformin: Blood Sugar, Gut Issues, and Training Adaptation
Metformin is the first-line medication for type 2 diabetes and increasingly prescribed for pre-diabetes and insulin resistance. If you have been told your blood sugar is trending upward and you have been started on metformin, the interaction with cycling training is worth understanding.
The first issue is gastrointestinal. Metformin is notorious for causing nausea, bloating, diarrhoea, and stomach cramping — particularly in the first few weeks of use and particularly when taken before exercise. The mechanism involves altered gut motility and changes to the intestinal microbiome. For a cyclist, mid-ride GI distress on top of the normal fuelling demands of a long ride can be miserable.
The second issue is more nuanced. Emerging research — including a 2019 study published in Aging Cell by Konopka and colleagues — suggests that metformin may blunt some exercise-induced adaptations, particularly mitochondrial respiration and cardiorespiratory fitness improvements, in older adults. The findings are mixed and the clinical significance for recreational athletes is not yet settled, but the observation is worth knowing. The concern is not that metformin prevents all adaptation. It is that it may reduce the magnitude of the mitochondrial response to training — the very adaptation that endurance exercise is designed to produce.
The third issue is fuelling. Metformin lowers blood glucose. Hard cycling depletes glycogen and blood glucose. The combination can produce hypoglycaemic episodes during long rides if fuelling is not managed carefully. This is especially relevant for rides over 90 minutes where carbohydrate intake needs to match expenditure.
What to discuss with your GP: If you are on metformin and experiencing GI distress during rides, discuss timing. Taking the dose after your ride rather than before can reduce symptoms substantially. Extended-release formulations (metformin MR) also tend to cause fewer gut issues than standard-release. If you are concerned about the training adaptation question, raise it — your GP may not have seen the Konopka research, but most are receptive to discussion. And if you are experiencing any symptoms of hypoglycaemia on rides (shakiness, confusion, disproportionate fatigue), discuss your fuelling strategy alongside your medication timing. A continuous glucose monitor, even temporarily, can reveal patterns that neither you nor your doctor would otherwise see.
The Practical Conversation: Bringing Your Training to Your GP
The recurring theme across every medication class in this article is the same: the prescription was written for a version of you that does not exist. Not because your doctor made an error, but because the default clinical framework assumes a sedentary baseline. Your baseline is different, and that difference changes the conversation about side effects, alternatives, and timing.
Most GPs are not anti-exercise. They are time-poor. A ten-minute appointment does not leave much room for a nuanced discussion about how atorvastatin interacts with your Tuesday threshold session. The burden of raising that conversation falls on you.
How to prepare
Bring data. Not every ride file. A one-page summary. Hours per week. Number of hard sessions. A brief description of what those sessions involve. Your GP does not need to understand FTP or TSS. They need to understand that you are not a casual walker — you are an athlete training with structure, intensity, and intent.
Describe the symptom, not the diagnosis. Do not walk in and say "I think my statin is causing myalgia." Say "I've had persistent quad aching for six weeks that doesn't correlate with my training load, doesn't respond to rest, and feels different from normal post-ride soreness. I'm on atorvastatin and wanted to ask whether there could be a connection." The first version sounds like you have been self-diagnosing on the internet. The second gives your GP clinical information they can work with.
Ask about exercise-compatible alternatives. For most medication classes, there are options that sit better alongside serious training. ACE inhibitors instead of beta blockers for blood pressure. Rosuvastatin instead of simvastatin. Extended-release metformin instead of standard. These are not radical requests. They are standard prescribing variations that your GP considers routinely.
Ask about timing. Many side effects can be reduced or eliminated by shifting the dose relative to your training. Statins in the morning instead of evening. Metformin after the ride instead of before. Blood pressure medication at night instead of morning. These are small changes that can make a meaningful difference. Your GP can advise on what is appropriate for your specific prescription.
Request a medication review. If you are on multiple medications and have not had a formal review in more than 12 months, request one. The NHS offers structured medication reviews through most GP practices. The purpose is to assess whether every medication is still appropriate, whether doses are correct, and whether any interactions exist between drugs. Add your training context to that review.
If your GP is not receptive
It happens. Some GPs are less familiar with exercise physiology, and some do not view sport-specific side effects as clinically significant. You have two options. Ask for a referral to a sports medicine physician — someone who manages athletes and understands the specific demands you are placing on your body. Or seek a second opinion. Your medication is your GP's clinical domain, but your experience of side effects during exercise is valid clinical information. A good prescriber will take it seriously.
The Bottom Line
You do not need to choose between your health and your training. The medications covered in this article exist for important clinical reasons, and for most riders, the right approach is not stopping treatment — it is adjusting the conversation. Understanding how your prescription interacts with your training gives you the language to have that conversation productively.
The pill you take every morning is part of your training environment, the same as your nutrition, your sleep, and your recovery protocols. Treat it accordingly. Talk to your GP. Bring your data. Ask the questions.
The informed patient is the one who gets the best care. That has always been true. It applies to your cycling as much as anything else.