Can you identify this pill?
dextroamphetamine
buprenorphine/naloxone
acyclovir
prasugrel
You are correct. Acyclovir is an antiviral used in adults and children to treat herpes simplex virus (HSV) and varicella zoster virus (VZV) infections, including genital and orolabial HSV, HSV encephalitis, chickenpox, and shingles.

As a reminder, you can use the Pill ID feature to identify a pill based on its imprint code or physical characteristics, including shape, color, and scoring. Find Pill ID in the epocrates app or on epocrates web.
[Source: Pill ID]
(World J Transplant)—A 50-year-old female kidney transplant recipient presented with progressive dry cough and fever x3 days, after recent contact with a symptomatic COVID-19–positive individual. Her COVID-19 nasopharyngeal swab was negative; however, chest CT revealed consolidation typical of the disease. Empiric tx was initiated, consisting of piperacillin/tazobactam 4.5 g tid; azithromycin 500 mg x1 dose, then 250 mg daily; chloroquine 800 mg x1 dose, then 400 mg daily; and oseltamivir 75 mg daily. Despite clinical improvement of lung consolidation, the patient’s serum creatinine and tacrolimus trough levels rose to 1.4 mg/dL and 23.58 ng/mL, respectively, 6 days after hospital admission. The elevated creatinine level was attributed to high tacrolimus levels.

Pre-admission meds: tacrolimus, mycophenolate mofetil, prednisone, amlodipine.

Which drug could have caused the elevation in tacrolimus levels?
piperacillin/tazobactam
oseltamivir
chloroquine
azithromycin
You are correct. Azithromycin (a P-gp inhibitor) inhibits the transport of tacrolimus (a P-gp substrate), leading to increased systemic tacrolimus exposure; therefore, coadministration with azithromycin requires monitoring of tacrolimus levels and renal function. While not reported in this patient, both azithromycin and tacrolimus are associated with prolongation of the QT interval; therefore, ECG monitoring is also recommended with this combo.

Source article: Oguz EG, Atilgan KG, Cimen SG, et al. COVID-19 infection in a kidney transplant recipient—special emphasis on pharmacokinetic interactions: A case report. World J Transplant 2020 Nov 28;10(11):365-371. doi: 10.5500/wjt.v10.i11.365.

More info is available in the free, full-text World J Transplant article PDF at PubMed Central.
All of these factors might be a reason for patients to get a vaccine sooner than 3 months if they've recently had COVID-19 EXCEPT:
Local COVID-19 hospital admission level
Concerns about timing with other vaccines such as influenza vaccines
Personal risk of severe disease
Risk of disease in a loved one or close contact
Characteristics of the most common COVID-19 variant currently causing illness
You are correct. There's no recommended waiting period between getting a COVID-19 vaccine and other vaccines. Individuals can get a COVID-19 vaccine and other vaccines, including a flu vaccine, at the same visit.

CDC recommends that individuals get a COVID-19 vaccine even if they've already had COVID-19.

People with known current SARS-CoV-2 infection should defer any COVID-19 vaccination at least until recovery from the acute illness (if symptoms were present) and criteria to discontinue isolation have been met.

People who recently had SARS-CoV-2 infection may consider delaying a COVID-19 vaccine dose by 3 months from symptom onset or positive test (if infection was asymptomatic). Studies have shown that increased time between infection and vaccination might result in an improved immune response to vaccination. Also, a low risk of reinfection has been observed in the weeks to months following infection. Individual factors such as risk of COVID-19 severe disease or characteristics of the predominant SARS-CoV-2 strain should be taken into account when determining whether to delay getting a COVID-19 vaccination after infection.

Viral testing to assess for acute SARS-CoV-2 infection or serologic testing to assess for prior infection is not recommended for the purpose of vaccine decision-making.

For more info, see CDC's Interim Clinical Considerations for Use of COVID-19 Vaccines in the United States and Getting Your COVID-19 Vaccine.