What are the side effects of tramadol when used for medial knee pain?

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Last updated: October 19, 2026 • View editorial policy

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Tramadol Side Effects

Tramadol commonly causes gastrointestinal and central nervous system adverse effects, with nausea, dizziness, constipation, vomiting, and somnolence being the most frequent, occurring in a dose-dependent manner and predominantly during initial treatment. 1

Most Common Side Effects

The FDA-approved drug label and multiple clinical guidelines consistently identify the following adverse effects 1:

Gastrointestinal Effects

  • Nausea (24-34% of patients)
  • Constipation (24-46% of patients)
  • Vomiting (9-17% of patients)
  • Dyspepsia (5-13%)
  • Diarrhea (5-10%)
  • Dry mouth (5-10%)

Central Nervous System Effects

  • Dizziness/Vertigo (26-33% of patients)
  • Somnolence (16-25% of patients)
  • Headache (18-32%)
  • CNS stimulation composite including nervousness, anxiety, agitation, tremor (7-14%)

Other Common Effects

  • Sweating (6-9%)
  • Pruritus (8-11%)
  • Asthenia/weakness (6-12%)

Serious and Life-Threatening Risks

Serotonin Syndrome

Tramadol must be used with extreme caution or avoided entirely in patients taking serotonergic medications (SSRIs, SNRIs, tricyclic antidepressants, MAO inhibitors) due to risk of potentially fatal serotonin syndrome 2. The NCCN 2025 guidelines specifically highlight this drug interaction as a critical safety concern.

Seizure Risk

Lower doses are mandatory for adults aged ≥75 years and those with hepatic/renal dysfunction to reduce seizure risk 2. Maximum daily doses should not exceed 400 mg for immediate-release or 300 mg for extended-release formulations in patients with normal organ function.

Abuse and Dependence

Tramadol carries risk of physical dependence, tolerance, and abuse potential despite being a weak mu-opioid agonist 1. The FDA label warns that withdrawal symptoms can occur with abrupt discontinuation, including restlessness, anxiety, insomnia, gastrointestinal symptoms, and autonomic hyperactivity.

Comparative Safety Profile

In cancer pain studies, tramadol produced more adverse effects (vomiting, dizziness, weakness) than hydrocodone and codeine 2. However, compared to morphine, tramadol showed lower rates of constipation, neuropsychological symptoms, and pruritus, though it was less effective for pain control.

Recent evidence from osteoarthritis studies demonstrates that tramadol increases all-cause serious adverse events compared to both oxycodone (HR 1.19) and hydrocodone (HR 1.40) in older adults following joint arthroplasty 3.

Dose-Dependent Effects

Adverse events are clearly dose-dependent, with tramadol 300 mg/day showing significantly higher rates of gastrointestinal adverse events (RR 6.02) compared to placebo, while 100 mg/day shows lower but still elevated risk (RR 2.29) 4.

Withdrawal Rates

Moderate quality evidence shows that tramadol causes substantially more treatment discontinuations due to adverse events compared to placebo (RR 2.64 for tramadol alone; RR 2.78 for tramadol with acetaminophen) 5. This represents a 12% absolute increase in withdrawal rates.

Temporal Pattern

Most adverse effects are mild to moderate in severity and occur more commonly during initial treatment than maintenance therapy 6. The incidence of side effects in recent studies ranges from 37.7% to 80.6% during dose escalation periods 7, 8.

Clinical Context for Knee Pain

For medial knee pain specifically, the 2020 ACR/Arthritis Foundation guidelines conditionally recommend tramadol over non-tramadol opioids when opioid therapy is necessary, but note the modest benefits must be weighed against the high risk of adverse effects 9. The 2022 AAOS guidelines recommend against routine use of oral narcotics including tramadol for knee osteoarthritis due to notable medication-related adverse effects without consistent improvement in pain and function 10.

Key Clinical Pitfalls

  • Do not overlook drug interactions: Always screen for serotonergic medications before prescribing
  • Adjust doses for age and organ function: Failure to reduce doses in elderly or renally/hepatically impaired patients increases seizure risk
  • Monitor during titration: Most adverse effects occur during initial treatment; slow titration may improve tolerability
  • Recognize opioid-like effects: Despite being a "weak" opioid, tramadol causes typical opioid adverse effects and requires similar monitoring for dependence

References

2
Guideline

adult cancer pain, version 2.2025, nccn clinical practice guidelines in oncology.

Journal of the National Comprehensive Cancer Network : JNCCN, 2025

5
Research

Tramadol for osteoarthritis.

The Cochrane database of systematic reviews, 2019

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.