The most commonly used oral chemotherapy drug for rectal cancer is capecitabine tablets. The regular dosing time is: half an hour after breakfast and dinner every day. The doctor will calculate the dose to be taken according to the body surface area of each person. The way to take the medication varies for different treatment purposes. Here are three ways to take capecitabine tablets The first way is to combine oral chemotherapy with preoperative radiation therapy: taking capecitabine tablets before surgery can improve the effectiveness of radiation therapy. The oral chemotherapy drug is started from the 1st day of radiotherapy. Take it for 5 weeks in total, 5 days each week, which is a 5×5 regimen. The patient can imagine that he or she is still a working person who needs to work every Monday through Friday and has weekends off. The same goes for the oral chemotherapy drugs, taking them for 5 days in a row and taking 2 days off. This is easier to remember. Each hospital has different radiation treatment times in the morning, midday and evening, but the oral medication should still be taken as one in the morning and one in the evening. The second way is together with intravenous chemotherapy: that is, a 3-week chemotherapy regimen: 1 day of intravenous chemotherapy, 2 weeks of oral chemotherapy drugs, and 1 week of rest. The oral 2-week chemotherapy drug is taken continuously without a break in between. The third way is to take oral chemotherapy drugs alone: for older patients who are intolerant to chemotherapy. You can try to take it in small doses at first and then increase it to the regular dose. This way, although it takes longer, is more easily tolerated by patients. This is done by taking oral medication for 2 weeks, stopping for 1 week and then continuing, and so on for a cycle of up to 6 months (pre-op plus post-op). Doctors generally recommend that patients take their medication on a daily basis and if they miss a meal, it is recommended that they do not take a replacement. Just take the next meal. For example, if a patient takes his medication at 8:00 a.m. every day and suddenly forgets to take it at 8:00 a.m. one day and remembers it at 10:00 a.m., he can continue to take the morning meal and the effect of taking the medication will not be greatly affected by taking it 1 to 2 hours later. If the 2nd day to remember the previous day forgot to take the medicine, do not take a double dose. Just take the normal dose. Patients are also instructed to take their medication on time and in the right amount in order to achieve a good therapeutic effect, and to avoid the phenomenon of missed doses as much as possible.