Can Cold Medicine Cause a Positive Morphine or Codeine Urine Test During Addiction Treatment in Taiwan?

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People undergoing addiction treatment, conditional deferred prosecution, probation supervision, or regular drug testing may worry that taking cold or cough medicine could cause a positive urine test.

Some cough medicines contain codeine. After codeine enters the body, part of it may be metabolized into morphine. As a result, a urine test may detect both codeine and morphine, creating questions about whether the result came from lawful medication or the use of heroin or another opioid.

A positive result does not automatically prove heroin use. The medication, dosage, time of use, individual metabolism, specimen collection time, and testing method must all be considered. The most important issue is whether the person can promptly provide reliable medical and medication records explaining the result.

1. Can You Take Cold Medicine During Addiction Treatment?

Being enrolled in addiction treatment does not mean that a person can never take medicine. However, self-medicating without checking the ingredients or keeping records can create unnecessary legal risks.

If you develop a cold, cough, sore throat, or fever, the safer approach is to visit a doctor or consult a pharmacist. Tell the healthcare professional that you are undergoing addiction treatment and may be required to take a judicial urine test.

👨🏻‍⚖️You should also keep:

■ Medical consultation records;

■ Prescriptions and medication bags;

■ Pharmacy receipts;

■ Medication instructions and packaging;

■ The name, dosage, and time of each medication taken; and

■ Any remaining medication.

➠Do not rely solely on a brand name. Different products under the same brand may contain different ingredients, and formulas can change depending on the manufacturer, dosage form, or applicable regulations.

2. What Is Codeine?

Codeine is a pharmaceutical ingredient used in certain cough suppressants, cough syrups, tablets, pain medications, and combination cold remedies.

A medicine containing codeine is not automatically an illegal drug. Codeine prescribed by a physician and lawfully obtained for medical treatment is legally different from the unlawful use of controlled substances.

However, lawful status does not mean the medicine cannot affect a drug test. For anyone subject to judicial urine 💡testing, the practical questions are:

■ Can the medicine produce substances included in the urine test?

■ Can the medication be verified through medical or pharmacy records?

■ Does the timing of the medication reasonably correspond with the specimen collection and laboratory result?

➠Therefore, both the legality of the medication and its possible effect on the test must be examined.

3. Why Can Codeine Produce a Morphine-Positive Result?

After a person takes codeine, the body absorbs, metabolizes, and eventually eliminates it. A portion of the codeine may be converted into morphine, while other portions may be excreted as unchanged codeine or related metabolites.

Consequently, urine collected after the use of codeine-containing medication may contain both codeine and morphine.

The concentration and relative amounts may be influenced by:

■ The dose and frequency of use;

■ The time between medication and specimen collection;

■ The formulation of the medicine;

■ Liver enzyme activity and individual metabolism;

■ The person’s health condition; and

■ Fluid intake and urination patterns.

Heroin can also produce morphine-related metabolites in the body. This is why detecting morphine alone—or even detecting both morphine and codeine—may not fully establish which substance was used.

The legal question is not merely whether morphine appeared in the urine. It is whether the full laboratory findings, medical records, timing, and other evidence support the conclusion that an illegal drug was used.

4. A Screening Test Is Not Necessarily the Final Result

Under Taiwan’s urine-testing procedures for drugs of abuse, testing generally involves an initial screening test and, where required, a confirmatory test.

The initial screening is primarily used to identify specimens requiring further examination. If the result reaches the relevant threshold or raises questions, confirmatory testing should generally be conducted using more specific methods, such as gas or liquid chromatography–mass spectrometry.

After receiving notice of a positive test, the person should determine:

■ Whether the result came from an initial screening or a completed confirmatory test;

■ Whether morphine, codeine, 6-acetylmorphine, or another metabolite was detected;

■ The concentration of each substance;

■ The threshold or quantitative standard applied;

■ The analytical method used;

■ The date and time of specimen collection and testing;

■ Whether the specimen number and chain-of-custody records are consistent; and

■ Whether the original specimen or a retest specimen remains available.

A verbal statement from a probation officer or case handler may not contain enough information to evaluate the result. The complete laboratory report should be reviewed before deciding how to respond.

5. Will a Positive Test Automatically Revoke Deferred Prosecution?

Under Taiwan’s Narcotics Hazard Prevention Act, a deferred prosecution disposition requiring the completion of addiction treatment is conditional. If the disposition is revoked, the prosecutor may resume the investigation or file charges.A positive drug test during the treatment period—or shortly before the scheduled completion of treatment—may lead to a finding that the person failed to complete the required program. It may therefore create a serious risk that deferred prosecution will be revoked.

However, a positive result should still be examined in context. It does not eliminate the person’s right to explain the result, submit medical evidence, question the testing procedure, or request further examination where appropriate.

If lawful medication may have affected the result, the person should submit the relevant records before a revocation decision is made. If a revocation notice has already been issued, the person should immediately ⚠️confirm:

■ The legal basis stated in the notice;

■ The laboratory findings relied upon;

■ The date the notice was received;

■ The deadline for responding or seeking relief; and

■ The criminal proceedings that may follow.

➠This should not be treated merely as a medical misunderstanding. Revocation may cause the original drug case to return to the investigation or prosecution stage.

6. Can the Morphine-to-Codeine Ratio Prove What Was Taken?

Laboratories and courts may consider the relative concentrations of morphine and codeine when distinguishing lawful codeine use from heroin exposure. However, the ratio is only one part of the evidence.

It should not be treated as an absolute formula because it may vary according to dosage, repeated use, metabolism, urine concentration, and the time of specimen collection.

Fixed ratios commonly mentioned online—such as “two to one” or “three times”—are not universal legal rules. The appropriate interpretation depends on the substances tested, the laboratory method, the specimen condition, and professional toxicological evidence.

In Supreme Court Criminal Judgment No. 705 of 2019, the Court addressed a dispute involving codeine-containing medication and the detection of codeine and morphine in urine. The judgment emphasized that the ratio may vary according to the frequency of use, individual physiology, metabolism, and collection time.

It also indicated that courts should not automatically apply general information from unrelated cases without giving the defendant an opportunity to respond or obtaining appropriate professional clarification. When a defendant identifies a specific medicine that may explain the result, the issue should be investigated based on the facts of that particular case.

Therefore, merely stating “I took cold medicine” is not enough. The person should identify the medication, ingredients, dosage, time of use, and related medical records.

7. Why Is 6-Acetylmorphine Important?

6-Acetylmorphine, also known as 6-MAM, is considered a more specific marker associated with heroin metabolism. Testing for 6-MAM may help distinguish heroin exposure from the lawful use of codeine-containing medication.

Nevertheless, the absence of 6-MAM does not always prove that heroin was not used. Its detectability may be affected by metabolism, the time of specimen collection, specimen storage, and laboratory sensitivity.

Likewise, the detection of a particular substance does not remove the need to examine the complete procedure and all other evidence.

When the main issue is whether the result came from lawful codeine use or heroin, a defense lawyer may evaluate 🔎whether further testing or expert analysis should address:

■ 6-acetylmorphine;

■ Acetylcodeine;

■ Morphine;

■ Codeine; and

■ Other relevant opioid metabolites.

➠Hair testing may sometimes be considered as supplementary evidence, but it is not automatically more accurate than urine testing. Hair tests involve separate issues such as sampling location, hair growth, external contamination, cosmetic treatment, and the time period represented by the sample.

8. How Should You Protect Yourself When Taking Cold Medicine?

If you are receiving addiction treatment or undergoing court-ordered testing, consider the following precautions:

■ Seek medical advice instead of using leftover medicine or medication recommended by another person.

■ Tell the doctor or pharmacist that you are subject to judicial drug testing.

■ Ask whether the medicine contains codeine or another ingredient that may affect the test.

■ Keep the prescription, medication bag, receipt, packaging, instructions, and remaining medicine.

■ Record when and how much medicine you took.

■ Avoid unidentified overseas medication or cough syrup without complete labeling.

■ Truthfully disclose recent medication when the urine collection form asks about drug use during the previous several days.

■ Provide copies of the medical and medication records to the probation officer or collection personnel and keep proof that the documents were submitted.

If paper records are unavailable, you may request medical, prescription, or dispensing records from the clinic, hospital, or pharmacy. National Health Insurance records may also be helpful, but not every self-paid treatment or pharmacy purchase will necessarily appear in the system.

9. What Should You Do After a Positive Urine Test?

If you are informed that your urine tested positive for morphine or codeine, take action promptly.

First, obtain the complete report. Confirm the detected substances, concentrations, applicable thresholds, testing method, specimen date, and whether the result was a screening or confirmatory test.

Second, collect all lawful medication records. Review not only cold medicine but also cough suppressants, painkillers, allergy medicine, sleeping medication, dental prescriptions, emergency treatment, and any other medication taken before the test.

Third, prepare a clear timeline. Identify when the symptoms began, when you visited the doctor, when the medication was dispensed and taken, when the urine was collected, and when you learned of the positive result.

💡Fourth, provide an explanation without waiting passively. Submit the timeline and supporting records to the responsible probation officer, prosecutor, or other authority.

Fifth, review the collection and chain-of-custody procedure. The specimen number, collection time, storage conditions, transportation process, and accompanying documents should be internally consistent.

Sixth, assess whether a retest or expert opinion is available. These procedures may be subject to strict deadlines, so the available options should be confirmed as soon as possible.

Do not delete messages, discard medication bags, alter records, or create documents after the fact. Original and verifiable records carry far greater evidentiary value.

10. Do National Health Insurance Records Automatically Prove Lawful Medication Use?

National Health Insurance records can show that a person visited a healthcare provider or received a particular medication on a specific date. They may therefore provide important supporting evidence.

🚨However, those records do not necessarily prove:

■ The exact time the medicine was taken;

■ The actual dosage consumed;

■ Whether the medication was taken as directed; or

■ Whether the detected substances scientifically correspond to that medicine.

➠Their value is stronger when the consultation date, medication ingredients, dosage, medication schedule, specimen collection time, and laboratory result are mutually consistent.

Records from self-paid clinics or pharmacy purchases may also be relevant. The key issue is not whether the medicine was obtained through National Health Insurance, but whether the medical and medication history is genuine, complete, and verifiable.

11. Lawful Medication Is Not a Universal Defense

The claim that a person took codeine-containing cold medicine cannot explain every positive test.

If the combination of metabolites, concentrations, collection time, or other evidence is inconsistent with ordinary medical use, the test may still be treated as evidence of unlawful drug use.

Conversely, a person who genuinely received and took lawful medication should not abandon the explanation merely because morphine or codeine was detected. The result should be evaluated together with the medication ingredients, medical records, laboratory data, and expert opinion.

Honest and timely disclosure supported by records is usually more persuasive than an explanation assembled only after revocation proceedings begin. If illegal drugs were in fact used, the full circumstances should be disclosed truthfully to the lawyer so that the treatment, procedural, and criminal risks can be properly assessed.

12. How Chien Sheng International Law Firm Can Assist

Disputes involving cold medicine and positive urine tests may involve medical treatment, toxicological analysis, addiction-treatment requirements, deferred prosecution, and criminal procedure at the same time.

Chien Sheng International Law Firm can assist with:

■ Reviewing addiction-treatment and probation obligations;

■ Examining urine collection forms and laboratory reports;

■ Reviewing chain-of-custody and specimen-handling records;

■ Analyzing the significance of morphine, codeine, 6-MAM, and other metabolites;

■ Organizing prescriptions, medication bags, medical records, and health insurance data;

■ Preparing a written explanation for prosecutors;

■ Evaluating requests for retesting or expert analysis; and

■ Assessing the consequences of revocation and any subsequent investigation or prosecution.

A single receipt or a general statement that “the cold medicine caused the result” may not be sufficient. The goal is to present the medical history, laboratory findings, and procedural records as one coherent and verifiable explanation.

Conclusion🔔

Having a cold during addiction treatment does not mean you must avoid all medication. The safer approach is to confirm the ingredients, obtain professional medical advice, and preserve complete records.

Codeine-containing medicine may cause both codeine and morphine to appear in urine. However, a positive result should not be interpreted without considering the testing method, concentrations, metabolites, collection time, and lawful medication history.

If you are subject to judicial drug testing, inform your doctor, disclose recent medication during specimen collection, and retain all medical documents. If you receive a positive result or notice that deferred prosecution may be revoked, obtain the full laboratory report and seek legal assistance promptly so that you do not miss an opportunity to provide an explanation, request further testing, or preserve important evidence.

👨🏻‍⚖️Chien Sheng International Law Firm reminds readers that this article provides general legal information only. It does not guarantee the outcome of any individual case and cannot replace legal advice based on the specific laboratory report, medical history, and procedural records involved. If you are concerned that cold medicine, cough medicine, or another lawful medication affected your urine test—or if you have received a positive result, revocation notice, or summons from a prosecutor—you should address the matter as early as possible.