Weight Gain and Edema Management, Monitoring of Repotrectinib (Augtyro) During Treatment

　　Repotrectinib(Augtyro)is used for the treatment of non‑small cell lung cancer.Patient eligibility shall follow the drug label and the physician’s clinical assessment.Most post‑treatment weight gain is mild to moderate fluid retention,which usually does not require discontinuation.It can be relieved by sodium restriction,appropriate physical activity and diuretic therapy when necessary.Obvious edema requires screening of cardiac and renal function.According to published safety data,the most common adverse reactions of this drug are dizziness,dysgeusia and constipation.Weight gain and edema are not the most frequent reactions,but relevant cases have been reported clinically.Most symptoms appear in the early stage of medication,are mild and reversible.If weight gain is accompanied by a significant increase in appetite,it is more likely related to changes in diet and activity habits.It is recommended to record baseline body weight and ankle circumference before treatment as a basis for subsequent comparison.If fatigue worsens,blood routine and electrolyte tests should be completed.

　　Distinguishing edema from fat gain is essential for assessment.Edema often presents as less swelling in the morning and more in the evening,pitting after pressing,tight shoes and socks,and rapid weight gain within a few days.Fat accumulation is a slow change over weeks to months,related to improved appetite and reduced activity.It is more accurate to weigh at a fixed time and measure ankle circumference with a soft tape than subjective judgment.Pressing the skin in front of the tibia for 5 seconds with slow recovery of the indentation indicates edema.Morning eyelid swelling is a common early manifestation and is easily ignored.

　　Edema is not always drug‑induced,and other causes need to be ruled out.Cardiac insufficiency,renal dysfunction,hypoproteinemia,hypothyroidism,and concurrent use of glucocorticoids or non‑steroidal anti‑inflammatory drugs can all induce edema.Tumor progression compressing veins or lymphatic drainage obstruction can cause unilateral limb swelling.When unilateral lower limb edema occurs,deep vein thrombosis should be ruled out first.Baseline liver and kidney function and thyroid function tests before medication facilitate subsequent comparisons.Hypothyroidism can aggravate edema,so thyroid function should be tested simultaneously during re‑examination.In case of unilateral lower limb swelling,venous ultrasound should be performed first to rule out thrombosis before evaluating drug‑related edema.

　　Intervention and dose adjustment for edema should be carried out by grading.Mild edema that does not affect daily activities is managed by sodium restriction,elevating the lower limbs and moderate exercise,with the original dose maintained for observation.Moderate edema that affects walking or causes rapid short‑term weight gain requires medical consultation to identify the cause,and drug suspension if necessary.Severe edema accompanied by dyspnea,oliguria or pleural effusion should be treated as an emergency.If treatment needs to be restarted after suspension,it usually starts from a lower dose,which is determined by comprehensive evaluation of the physician.Do not reduce the dose uniformly on your own.

　　Patients are not recommended to purchase or take diuretics by themselves.Diuretic therapy can easily cause electrolyte disturbance.Combined with dizziness caused by repotrectinib,it increases the risk of falls.Whether to use diuretics,the type of drug and the duration of treatment should be determined by the physician after evaluating cardiac and renal function and electrolytes.Potassium and creatinine should be rechecked after medication.If diuretics are prescribed,daily urine output and weight changes should be recorded.Electrolytes should be rechecked weekly during diuretic treatment to prevent arrhythmia induced by hypokalemia.

　　Daily diet and activity adjustments can help relieve edema.Control daily salt intake and reduce pickled and processed foods.Ensure high‑quality protein supply to avoid edema caused by hypoproteinemia.Avoid prolonged sitting or standing,get up and move every hour,and elevate the lower limbs appropriately during rest.Weighing is recommended after morning urination with the same scale.Ankle pump exercises can be done during prolonged sitting to promote venous return and reduce the feeling of heaviness in the lower limbs.Elevating the lower limbs during sleep is more effective in relieving evening edema.

　　During medication,watch for signs of cardiac dysfunction.Shortness of breath after activity,inability to lie flat at night,need to sleep with a high pillow,bilateral symmetrical edema of lower limbs with rapid weight gain all suggest possible cardiac insufficiency.Seek medical attention immediately and complete cardiac ultrasound and natriuretic peptide tests instead of continuous observation.Nocturnal paroxysmal dyspnea requires prompt medical consultation.If cardiac ultrasound results are abnormal,suspend medication and consult the cardiology department.

　　Most mild to moderate edema gradually relieves within weeks after dose reduction or drug withdrawal,and body weight then drops.If edema is caused by cardiorenal impairment,recovery depends on whether the primary disease is corrected.Before deciding to discontinue the drug,communicate with the physician to explore alternative treatment options,so as not to abandon effective treatment due to manageable edema.Continue to monitor body weight during recovery to prevent re‑accumulation of fluid.After stabilization,retest body weight every two weeks to confirm the condition is stable.

　　Standardized follow‑up monitoring can identify risks early.Measure body weight,ankle circumference and blood pressure at each follow‑up visit.Review liver and kidney function,electrolytes and thyroid function as planned.Patients with a history of heart disease should regularly complete cardiac ultrasound.Comparing the weight change curve with the medication time helps to judge the association between adverse reactions and the drug.Do not attribute all weight fluctuations to the drug.When body weight and ankle circumference rise simultaneously,shorten the re‑examination interval.Elevated blood pressure often occurs simultaneously with fluid retention,which needs to be measured and recorded synchronously.

　　Self‑monitoring helps physicians evaluate the condition in a timely manner.It is recommended to weigh and measure ankle circumference at a fixed time every week,and record water intake,urine output and tightness of lower limbs.If the weight increases by more than 2 kg within two weeks accompanied by shortness of breath or decreased urine output,seek medical attention in advance to check cardiorenal function and pleural effusion,instead of waiting for the scheduled re‑examination date.Record the diet and activity of the day synchronously to facilitate comprehensive judgment by physicians.Relevant records should be kept for at least three months for trend review.For those with continuous weight gain,shorten the re‑examination interval and recheck cardiac ultrasound if necessary.