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Dear Dr. Roach: In December, I developed an abscess in my jaw from food getting caught in my tooth. I went to see a dentist who prescribed clindamycin and metronidazole. I came down with a case of C. difficile.

Dear Dr. Roach: For months, I have had a persistent cough that I have been unable to get help with. I saw an allergist about three years ago and was told I am allergic to dust mites (I understand a large number of people fit into this category).

Dear Dr. Roach: I am 77 years old. When I go to a new doctor, there is always that past history form to fill out.

Dear Dr. Roach: My wife has had dementia for more than two years. There is an ad in our local paper for an Alzheimer鈥檚 disease study.

Dear Dr. Roach: I am a healthy male, age 66, non-smoker, not overweight, who takes no medication.

Dear Dr. Roach: Have any studies been done on Demerol to check its effect on older people? I know of four people who were out of their minds with hallucinations for three or four days after being given Demerol. B.L.

Dear Dr. Roach: My brother got very thin (112 pounds and he is six feet tall) from anxiety. When he gets really worked up, he doesn鈥檛 eat. His doctor put him on medication for this, which, she said, would help him gain weight.

Dear Dr. Roach: I am a 72-year-old woman in fair health. I had strong bones until I had gastric bypass surgery. Within two years, I developed osteoporosis. In 2016 my parathyroid hormone level was found to be elevated.

Dear Dr. Roach: My seven-year-old grandson has a question: 鈥淗ow can I be a science doctor like you?鈥� Thank you, C.F. Being a doctor is great 鈥� I wouldn鈥檛 change it for any other job 鈥� but it isn鈥檛 right for everyone.

Dear Dr. Roach: My husband, 79 years old, is getting up five or six times at night to urinate. The urgent care doctor said he doesn鈥檛 have an infection but doesn鈥檛 know what鈥檚 going on. He is taking Flomax, but that doesn鈥檛 seem to be helping.