Final answer:
For someone allergic to penicillin, safe antibiotic alternatives include ciprofloxacin, erythromycin, and doxycycline. These antibiotics belong to different classes than penicillins and are generally considered effective and safe for patients with penicillin allergies.
Step-by-step explanation:
For someone allergic to penicillin, it is important to prescribe an antibiotic that does not belong to the beta-lactam class of antibiotics, as this is where penicillins are categorized. Among the options provided, amoxicillin should be avoided, as it is a penicillin derivative. Ciprofloxacin is a fluoroquinolone, and fluoroquinolones are often used as alternatives for those with penicillin allergies. However, erythromycin and doxycycline, which belong to the macrolides and tetracyclines classes respectively, are generally safe alternatives and are commonly prescribed to patients with penicillin allergies. Both erythromycin and doxycycline are known to be effective in treating infections without the risk of an allergic reaction related to penicillin. Considering the safety and efficacy, the correct choice would be either b. Ciprofloxacin, c. Erythromycin or d. Doxycycline.