| breast milk | 0.34 |
| plant | 0.25 |
| animal | 0.25 |
| relieve pain | 0.68 |
| act on central nervous … | 0.48 |
| activate opioid recepto… | 0.42 |
| cross placental membran… | 0.40 |
| change the way | 0.38 |
| decrease anxiety | 0.36 |
| act as partial agonist | 0.34 |
| produce euphoria | 0.33 |
| increase the frequency … | 0.32 |
| range in concentration | 0.29 |
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| constipation | 0.41 |
| respiratory depression | 0.35 |
| death | 0.34 |
| reduction | 0.34 |
| marked increase | 0.29 |
| sedation | 0.27 |
| miosis | 0.25 |
| side effects | 0.16 |
| fetal harm | 0.16 |
| drowsiness | 0.16 |
| high potential | 0.38 |
| the greatest potential | 0.25 |
| widespread effects | 0.25 |
| negative impact | 0.16 |
| addictive | 0.65 |
| effective | 0.64 |
| detectable | 0.61 |
| excreted unmetabolized | 0.43 |
| necessary | 0.34 |
| safe | 0.32 |
| cheap | 0.30 |
| excreted unchanged | 0.29 |
| mutagenic | 0.29 |
| more addictive than opi… | 0.27 |
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| addiction | 0.38 |
| drug | 0.52 |
| opiate | 0.50 |
| analgesic drug | 0.47 |
| principal constituent o… | 0.38 |
| occurring substance | 0.25 |
| the most commonly used … | 0.25 |
| sedative | 0.16 |
| administered | 0.72 |
| used to treat pain | 0.69 |
| extracted | 0.58 |
| injected | 0.55 |
| produced | 0.49 |
| metabolized | 0.44 |
| used in medical settings | 0.38 |
| metabolized by conjugat… | 0.38 |
| released | 0.36 |
| used with caution | 0.35 |
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