1. Take it on an empty stomach (in the morning): mostly nourishing drugs, hungry ginseng, bee milk, etc. Take it on an empty stomach in the morning, which is convenient for the human body to absorb it quickly and make full use of it.

2. Take on a semi-empty stomach: most of them are insect repellent drugs, such as Quyiling, which can be taken between meals or just after breakfast, so that the drugs can quickly enter the intestine and maintain a high concentration to play a role, and will not stimulate the gastrointestinal tract and cause nausea, vomiting, or even poisoning due to rapid absorption in the intestine.

3. Take before meals (30-60 minutes before meals): most of them are stomach-invigorating drugs, astringent drugs, stomachache-relieving drugs, and intestinal anti-inflammatory drugs, such as multi-enzyme tablets, lactase, metoclopramide, atropine, tetracycline, etc. According to their respective action characteristics, these drugs can achieve the best effect when taken before meals. In addition, Chinese patent medicine pills should be taken before meals, so that they can quickly pass through the stomach without being hindered by food.

4. Take with meals: mostly digestive drugs, such as dilute hydrochloric acid and pepsin. Taking it with meals can play a role in time.

5. Take after meals (15- 30 minutes after meals): most drugs are taken after meals, especially those with strong irritation, such as aspirin, sodium salicylate, phenylbutazone, indomethacin, ferrous sulfate and berberine. It should be taken after meals to dilute the stomach and reduce the irritation to the gastric mucosa.

6. Take it before going to bed (15- 30 minutes before going to bed): most of them are hypnotics, such as Lumina, Diazepam, Zhusha Anshen Pill, etc. And laxatives, such as Fenting diacetate and phenolphthalein fruit guide, are effective after taking 8- 12 hours, so defecation is expected in the morning.

7. Diazepam: Most of them are antibacterial and anti-inflammatory drugs that are absorbed and excreted quickly, such as tetracycline, oxytetracycline and erythromycin. Because they are excreted or destroyed quickly, they must be taken regularly to maintain the effective concentration.

8. Take it when necessary: mostly antispasmodic painkillers, such as belladonna, atropine, propofol, etc. Take APC for stomach cramps, benzene tablets for colds and fevers, painkillers for headaches and nitroglycerin sublingual tablets for angina pectoris.

So choose: B.